1255661315340 has 48 divisors (see below), whose sum is σ = 3601604170080. Its totient is φ = 326676113920.

The previous prime is 1255661315323. The next prime is 1255661315341. The reversal of 1255661315340 is 435131665521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1255661315292 and 1255661315301.

It is not an unprimeable number, because it can be changed into a prime (1255661315341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255213255 + ... + 255218174.

It is an arithmetic number, because the mean of its divisors is an integer number (75033420210).

Almost surely, 2^{1255661315340} is an apocalyptic number.

1255661315340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255661315340 is an abundant number, since it is smaller than the sum of its proper divisors (2345942854740).

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

1255661315340 is a wasteful number, since it uses less digits than its factorization.

1255661315340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510431482 (or 510431480 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 1255661315340 in words is "one trillion, two hundred fifty-five billion, six hundred sixty-one million, three hundred fifteen thousand, three hundred forty".