256102631013 has 4 divisors (see below), whose sum is σ = 341470174688. Its totient is φ = 170735087340.

The previous prime is 256102631011. The next prime is 256102631039. The reversal of 256102631013 is 310136201652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256102631013 - 2¹ = 256102631011 is a prime.

It is a super-2 number, since 2×256102631013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256102631011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42683771833 + ... + 42683771838.

It is an arithmetic number, because the mean of its divisors is an integer number (85367543672).

Almost surely, 2^256102631013 is an apocalyptic number.

It is an amenable number.

256102631013 is a deficient number, since it is larger than the sum of its proper divisors (85367543675).

256102631013 is an equidigital number, since it uses as much as digits as its factorization.

256102631013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85367543674.

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 256102631013 its reverse (310136201652), we get a palindrome (566238832665).

The spelling of 256102631013 in words is "two hundred fifty-six billion, one hundred two million, six hundred thirty-one thousand, thirteen".