256642111400537 has 4 divisors (see below), whose sum is σ = 258601211487696. Its totient is φ = 254683011313380.

The previous prime is 256642111400533. The next prime is 256642111400551. The reversal of 256642111400537 is 735004111246652.

256642111400537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 256642111400537 - 2² = 256642111400533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256642111400491 and 256642111400500.

It is not an unprimeable number, because it can be changed into a prime (256642111400531) 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, 979550043383 + ... + 979550043644.

It is an arithmetic number, because the mean of its divisors is an integer number (64650302871924).

Almost surely, 2^{256642111400537} is an apocalyptic number.

It is an amenable number.

256642111400537 is a deficient number, since it is larger than the sum of its proper divisors (1959100087159).

256642111400537 is a wasteful number, since it uses less digits than its factorization.

256642111400537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959100087158.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 256642111400537 in words is "two hundred fifty-six trillion, six hundred forty-two billion, one hundred eleven million, four hundred thousand, five hundred thirty-seven".