256788775501 has 4 divisors (see below), whose sum is σ = 256790991004. Its totient is φ = 256786560000.

The previous prime is 256788775427. The next prime is 256788775519. The reversal of 256788775501 is 105577887652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 239439934276 + 17348841225 = 489326^2 + 131715^2 .

It is a cyclic number.

It is not a de Polignac number, because 256788775501 - 2²¹ = 256786678349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256788775501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256788775571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923700 + ... + 1169101.

It is an arithmetic number, because the mean of its divisors is an integer number (64197747751).

Almost surely, 2^256788775501 is an apocalyptic number.

It is an amenable number.

256788775501 is a deficient number, since it is larger than the sum of its proper divisors (2215503).

256788775501 is a wasteful number, since it uses less digits than its factorization.

256788775501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215502.

The product of its (nonzero) digits is 32928000, while the sum is 61.

The spelling of 256788775501 in words is "two hundred fifty-six billion, seven hundred eighty-eight million, seven hundred seventy-five thousand, five hundred one".