256763160505 has 8 divisors (see below), whose sum is σ = 309394282824. Its totient is φ = 204558201600.

The previous prime is 256763160503. The next prime is 256763160541. The reversal of 256763160505 is 505061367652.

It can be written as a sum of positive squares in 4 ways, for example, as 117487159696 + 139276000809 = 342764^2 + 373197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256763160505 - 2¹ = 256763160503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256763160503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106539526 + ... + 106541935.

It is an arithmetic number, because the mean of its divisors is an integer number (38674285353).

Almost surely, 2^256763160505 is an apocalyptic number.

It is an amenable number.

256763160505 is a deficient number, since it is larger than the sum of its proper divisors (52631122319).

256763160505 is a wasteful number, since it uses less digits than its factorization.

256763160505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213081707.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The spelling of 256763160505 in words is "two hundred fifty-six billion, seven hundred sixty-three million, one hundred sixty thousand, five hundred five".