256724640632775 has 48 divisors (see below), whose sum is σ = 485274399252224. Its totient is φ = 117314574842880.

The previous prime is 256724640632749. The next prime is 256724640632797. The reversal of 256724640632775 is 577236046427652.

It is not a de Polignac number, because 256724640632775 - 2⁸ = 256724640632519 is a prime.

It is a super-2 number, since 2×256724640632775² (a number of 30 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 92930869 + ... + 95653518.

Almost surely, 2^{256724640632775} is an apocalyptic number.

256724640632775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256724640632775 is a deficient number, since it is larger than the sum of its proper divisors (228549758619449).

256724640632775 is a wasteful number, since it uses less digits than its factorization.

256724640632775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188587000 (or 188586995 counting only the distinct ones).

The product of its (nonzero) digits is 711244800, while the sum is 66.

The spelling of 256724640632775 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, six hundred forty million, six hundred thirty-two thousand, seven hundred seventy-five".