256135370399 has 2 divisors, whose sum is σ = 256135370400. Its totient is φ = 256135370398.

The previous prime is 256135370369. The next prime is 256135370431. The reversal of 256135370399 is 993073531652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256135370399 - 2²⁸ = 255866934943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256135370399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256135370339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128067685199 + 128067685200.

It is an arithmetic number, because the mean of its divisors is an integer number (128067685200).

Almost surely, 2^256135370399 is an apocalyptic number.

256135370399 is a deficient number, since it is larger than the sum of its proper divisors (1).

256135370399 is an equidigital number, since it uses as much as digits as its factorization.

256135370399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4592700, while the sum is 53.

The spelling of 256135370399 in words is "two hundred fifty-six billion, one hundred thirty-five million, three hundred seventy thousand, three hundred ninety-nine".