256641437053165 has 8 divisors (see below), whose sum is σ = 310009259063808. Its totient is φ = 203953459909200.

The previous prime is 256641437053087. The next prime is 256641437053193. The reversal of 256641437053165 is 561350734146652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256641437053165 - 2³³ = 256632847118573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169961215837 + ... + 169961217346.

It is an arithmetic number, because the mean of its divisors is an integer number (38751157382976).

Almost surely, 2^{256641437053165} is an apocalyptic number.

It is an amenable number.

256641437053165 is a deficient number, since it is larger than the sum of its proper divisors (53367822010643).

256641437053165 is a wasteful number, since it uses less digits than its factorization.

256641437053165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339922433339.

The product of its (nonzero) digits is 54432000, while the sum is 58.

The spelling of 256641437053165 in words is "two hundred fifty-six trillion, six hundred forty-one billion, four hundred thirty-seven million, fifty-three thousand, one hundred sixty-five".