1255533543040 has 128 divisors (see below), whose sum is σ = 3434090140800. Its totient is φ = 429992644608.

The previous prime is 1255533543007. The next prime is 1255533543073. The reversal of 1255533543040 is 403453355521.

It is an interprime number because it is at equal distance from previous prime (1255533543007) and next prime (1255533543073).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1255533542984 and 1255533543002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3908866 + ... + 4217854.

It is an arithmetic number, because the mean of its divisors is an integer number (26828829225).

Almost surely, 2^{1255533543040} is an apocalyptic number.

1255533543040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255533543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717045070400).

1255533543040 is an abundant number, since it is smaller than the sum of its proper divisors (2178556597760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255533543040 is an equidigital number, since it uses as much as digits as its factorization.

1255533543040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309922 (or 309910 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 40.

Adding to 1255533543040 its reverse (403453355521), we get a palindrome (1658986898561).

The spelling of 1255533543040 in words is "one trillion, two hundred fifty-five billion, five hundred thirty-three million, five hundred forty-three thousand, forty".