256788775507 has 16 divisors (see below), whose sum is σ = 287970301440. Its totient is φ = 227003515200.

The previous prime is 256788775427. The next prime is 256788775519. The reversal of 256788775507 is 705577887652.

It is not a de Polignac number, because 256788775507 - 2²³ = 256780386899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256788775597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2195007 + ... + 2309032.

It is an arithmetic number, because the mean of its divisors is an integer number (17998143840).

Almost surely, 2^256788775507 is an apocalyptic number.

256788775507 is a deficient number, since it is larger than the sum of its proper divisors (31181525933).

256788775507 is a wasteful number, since it uses less digits than its factorization.

256788775507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504194.

The product of its (nonzero) digits is 230496000, while the sum is 67.

The spelling of 256788775507 in words is "two hundred fifty-six billion, seven hundred eighty-eight million, seven hundred seventy-five thousand, five hundred seven".