256860553751 has 2 divisors, whose sum is σ = 256860553752. Its totient is φ = 256860553750.

The previous prime is 256860553727. The next prime is 256860553753. The reversal of 256860553751 is 157355068652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256860553751 is a prime.

Together with 256860553753, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256860553693 and 256860553702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256860553753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128430276875 + 128430276876.

It is an arithmetic number, because the mean of its divisors is an integer number (128430276876).

Almost surely, 2^256860553751 is an apocalyptic number.

256860553751 is a deficient number, since it is larger than the sum of its proper divisors (1).

256860553751 is an equidigital number, since it uses as much as digits as its factorization.

256860553751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560000, while the sum is 53.

The spelling of 256860553751 in words is "two hundred fifty-six billion, eight hundred sixty million, five hundred fifty-three thousand, seven hundred fifty-one".