256516512351616 has 32 divisors (see below), whose sum is σ = 557486170312680. Its totient is φ = 116598414704640.

The previous prime is 256516512351577. The next prime is 256516512351643. The reversal of 256516512351616 is 616153215615652.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×256516512351616² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91092510081 + ... + 91092512896.

Almost surely, 2^{256516512351616} is an apocalyptic number.

It is an amenable number.

256516512351616 is an abundant number, since it is smaller than the sum of its proper divisors (300969657961064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256516512351616 is a wasteful number, since it uses less digits than its factorization.

256516512351616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182185023002 (or 182185022990 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 55.

The spelling of 256516512351616 in words is "two hundred fifty-six trillion, five hundred sixteen billion, five hundred twelve million, three hundred fifty-one thousand, six hundred sixteen".