256613071665650 has 96 divisors (see below), whose sum is σ = 556387591260288. Its totient is φ = 86233508236800.

The previous prime is 256613071665583. The next prime is 256613071665791. The reversal of 256613071665650 is 56566170316652.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256613071665650.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15193547 + ... + 27277646.

It is an arithmetic number, because the mean of its divisors is an integer number (5795704075628).

Almost surely, 2^{256613071665650} is an apocalyptic number.

256613071665650 is an abundant number, since it is smaller than the sum of its proper divisors (299774519594638).

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

256613071665650 is a wasteful number, since it uses less digits than its factorization.

256613071665650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42471556 (or 42471551 counting only the distinct ones).

The product of its (nonzero) digits is 40824000, while the sum is 59.

The spelling of 256613071665650 in words is "two hundred fifty-six trillion, six hundred thirteen billion, seventy-one million, six hundred sixty-five thousand, six hundred fifty".