256643100763633 has 4 divisors (see below), whose sum is σ = 256643147844720. Its totient is φ = 256643053682548.

The previous prime is 256643100763631. The next prime is 256643100763663. The reversal of 256643100763633 is 336367001346652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256643100763633 - 2¹ = 256643100763631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256643100763631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14102623 + ... + 26686516.

It is an arithmetic number, because the mean of its divisors is an integer number (64160786961180).

Almost surely, 2^{256643100763633} is an apocalyptic number.

It is an amenable number.

256643100763633 is a deficient number, since it is larger than the sum of its proper divisors (47081087).

256643100763633 is an equidigital number, since it uses as much as digits as its factorization.

256643100763633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47081086.

The product of its (nonzero) digits is 29393280, while the sum is 55.

The spelling of 256643100763633 in words is "two hundred fifty-six trillion, six hundred forty-three billion, one hundred million, seven hundred sixty-three thousand, six hundred thirty-three".