256531402513 has 12 divisors (see below), whose sum is σ = 264181134000. Its totient is φ = 249097261392.

The previous prime is 256531402489. The next prime is 256531402529. The reversal of 256531402513 is 315204135652.

It is not a de Polignac number, because 256531402513 - 2²⁹ = 255994531601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256531402583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495370 + ... + 870892.

It is an arithmetic number, because the mean of its divisors is an integer number (22015094500).

Almost surely, 2^256531402513 is an apocalyptic number.

It is an amenable number.

256531402513 is a deficient number, since it is larger than the sum of its proper divisors (7649731487).

256531402513 is an equidigital number, since it uses as much as digits as its factorization.

256531402513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376096 (or 376059 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 256531402513 in words is "two hundred fifty-six billion, five hundred thirty-one million, four hundred two thousand, five hundred thirteen".