256575757567 has 4 divisors (see below), whose sum is σ = 256585678056. Its totient is φ = 256565837080.

The previous prime is 256575757553. The next prime is 256575757601. The reversal of 256575757567 is 765757575652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256575757567 - 2³¹ = 254428273919 is a prime.

It is a super-2 number, since 2×256575757567² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256575757517) 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, 4921348 + ... + 4973209.

It is an arithmetic number, because the mean of its divisors is an integer number (64146419514).

Almost surely, 2^256575757567 is an apocalyptic number.

256575757567 is a deficient number, since it is larger than the sum of its proper divisors (9920489).

256575757567 is an equidigital number, since it uses as much as digits as its factorization.

256575757567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9920488.

The product of its digits is 540225000, while the sum is 67.

It can be divided in two parts, 256575757 and 567, that added together give a square (256576324 = 16018²).

The spelling of 256575757567 in words is "two hundred fifty-six billion, five hundred seventy-five million, seven hundred fifty-seven thousand, five hundred sixty-seven".