1256322133000 has 128 divisors (see below), whose sum is σ = 3238803584640. Its totient is φ = 452320800000.

The previous prime is 1256322132979. The next prime is 1256322133021. The reversal of 1256322133000 is 3312236521.

It is an interprime number because it is at equal distance from previous prime (1256322132979) and next prime (1256322133021).

It is a self number, because there is not a number n which added to its sum of digits gives 1256322133000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 545599 + ... + 1676401.

It is an arithmetic number, because the mean of its divisors is an integer number (25303153005).

Almost surely, 2^{1256322133000} is an apocalyptic number.

1256322133000 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 1256322133000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1619401792320).

1256322133000 is an abundant number, since it is smaller than the sum of its proper divisors (1982481451640).

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

1256322133000 is a wasteful number, since it uses less digits than its factorization.

1256322133000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130936 (or 1130922 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 1256322133000 its reverse (3312236521), we get a palindrome (1259634369521).

The spelling of 1256322133000 in words is "one trillion, two hundred fifty-six billion, three hundred twenty-two million, one hundred thirty-three thousand".