256116814421 has 12 divisors (see below), whose sum is σ = 277456020228. Its totient is φ = 236311156224.

The previous prime is 256116814399. The next prime is 256116814469. The reversal of 256116814421 is 124418611652.

It can be written as a sum of positive squares in 6 ways, for example, as 41344900 + 256075469521 = 6430^2 + 506039^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256116814421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256116814021) 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, 50771 + ... + 717503.

It is an arithmetic number, because the mean of its divisors is an integer number (23121335019).

Almost surely, 2^256116814421 is an apocalyptic number.

It is an amenable number.

256116814421 is a deficient number, since it is larger than the sum of its proper divisors (21339205807).

256116814421 is a wasteful number, since it uses less digits than its factorization.

256116814421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669032 (or 669019 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The spelling of 256116814421 in words is "two hundred fifty-six billion, one hundred sixteen million, eight hundred fourteen thousand, four hundred twenty-one".