256212564633361 has 16 divisors (see below), whose sum is σ = 298265754712320. Its totient is φ = 215558245774080.

The previous prime is 256212564633329. The next prime is 256212564633367. The reversal of 256212564633361 is 163336465212652.

It is a cyclic number.

It is not a de Polignac number, because 256212564633361 - 2⁵ = 256212564633329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256212564633367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500849405 + ... + 1501020106.

It is an arithmetic number, because the mean of its divisors is an integer number (18641609669520).

Almost surely, 2^{256212564633361} is an apocalyptic number.

It is an amenable number.

256212564633361 is a deficient number, since it is larger than the sum of its proper divisors (42053190078959).

256212564633361 is a wasteful number, since it uses less digits than its factorization.

256212564633361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001869744.

The product of its digits is 27993600, while the sum is 55.

The spelling of 256212564633361 in words is "two hundred fifty-six trillion, two hundred twelve billion, five hundred sixty-four million, six hundred thirty-three thousand, three hundred sixty-one".