256809101933 has 2 divisors, whose sum is σ = 256809101934. Its totient is φ = 256809101932.

The previous prime is 256809101911. The next prime is 256809101977. The reversal of 256809101933 is 339101908652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176885854084 + 79923247849 = 420578^2 + 282707^2 .

It is a cyclic number.

It is not a de Polignac number, because 256809101933 - 2²⁴ = 256792324717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256809101993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128404550966 + 128404550967.

It is an arithmetic number, because the mean of its divisors is an integer number (128404550967).

Almost surely, 2^256809101933 is an apocalyptic number.

It is an amenable number.

256809101933 is a deficient number, since it is larger than the sum of its proper divisors (1).

256809101933 is an equidigital number, since it uses as much as digits as its factorization.

256809101933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 256809101933 in words is "two hundred fifty-six billion, eight hundred nine million, one hundred one thousand, nine hundred thirty-three".