256774696501 has 2 divisors, whose sum is σ = 256774696502. Its totient is φ = 256774696500.

The previous prime is 256774696463. The next prime is 256774696579. The reversal of 256774696501 is 105696477652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249674106276 + 7100590225 = 499674^2 + 84265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256774696501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256774636501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128387348250 + 128387348251.

It is an arithmetic number, because the mean of its divisors is an integer number (128387348251).

Almost surely, 2^256774696501 is an apocalyptic number.

It is an amenable number.

256774696501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256774696501 is an equidigital number, since it uses as much as digits as its factorization.

256774696501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 256774696501 in words is "two hundred fifty-six billion, seven hundred seventy-four million, six hundred ninety-six thousand, five hundred one".