1256323015401 has 16 divisors (see below), whose sum is σ = 1676383644096. Its totient is φ = 836905720896.

The previous prime is 1256323015397. The next prime is 1256323015417. The reversal of 1256323015401 is 1045103236521.

It is not a de Polignac number, because 1256323015401 - 2² = 1256323015397 is a prime.

It is a super-2 number, since 2×1256323015401² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1256323015301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31888551 + ... + 31927923.

It is an arithmetic number, because the mean of its divisors is an integer number (104773977756).

Almost surely, 2^{1256323015401} is an apocalyptic number.

It is an amenable number.

1256323015401 is a deficient number, since it is larger than the sum of its proper divisors (420060628695).

1256323015401 is a wasteful number, since it uses less digits than its factorization.

1256323015401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47272.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 1256323015401 in words is "one trillion, two hundred fifty-six billion, three hundred twenty-three million, fifteen thousand, four hundred one".