256390472887 has 2 divisors, whose sum is σ = 256390472888. Its totient is φ = 256390472886.

The previous prime is 256390472873. The next prime is 256390472903. The reversal of 256390472887 is 788274093652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256390472887 is a prime.

It is a super-2 number, since 2×256390472887² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256390472827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128195236443 + 128195236444.

It is an arithmetic number, because the mean of its divisors is an integer number (128195236444).

Almost surely, 2^256390472887 is an apocalyptic number.

256390472887 is a deficient number, since it is larger than the sum of its proper divisors (1).

256390472887 is an equidigital number, since it uses as much as digits as its factorization.

256390472887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 256390472887 in words is "two hundred fifty-six billion, three hundred ninety million, four hundred seventy-two thousand, eight hundred eighty-seven".