256680013161 has 32 divisors (see below), whose sum is σ = 412939029888. Its totient is φ = 139716195840.

The previous prime is 256680013159. The next prime is 256680013199. The reversal of 256680013161 is 161310086652.

It is not a de Polignac number, because 256680013161 - 2¹ = 256680013159 is a prime.

It is a super-2 number, since 2×256680013161² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (256680013111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8069556 + ... + 8101301.

It is an arithmetic number, because the mean of its divisors is an integer number (12904344684).

Almost surely, 2^256680013161 is an apocalyptic number.

It is an amenable number.

256680013161 is a deficient number, since it is larger than the sum of its proper divisors (156259016727).

256680013161 is a wasteful number, since it uses less digits than its factorization.

256680013161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16170921.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 256680013161 in words is "two hundred fifty-six billion, six hundred eighty million, thirteen thousand, one hundred sixty-one".