256135370401 has 4 divisors (see below), whose sum is σ = 256227210900. Its totient is φ = 256043529904.

The previous prime is 256135370399. The next prime is 256135370431. The reversal of 256135370401 is 104073531652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215250530401 + 40884840000 = 463951^2 + 202200^2 .

It is a cyclic number.

It is not a de Polignac number, because 256135370401 - 2¹ = 256135370399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256135370431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45916066 + ... + 45921643.

It is an arithmetic number, because the mean of its divisors is an integer number (64056802725).

Almost surely, 2^256135370401 is an apocalyptic number.

It is an amenable number.

256135370401 is a deficient number, since it is larger than the sum of its proper divisors (91840499).

256135370401 is an equidigital number, since it uses as much as digits as its factorization.

256135370401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91840498.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 256135370401 in words is "two hundred fifty-six billion, one hundred thirty-five million, three hundred seventy thousand, four hundred one".