256902493679 has 4 divisors (see below), whose sum is σ = 276664223976. Its totient is φ = 237140763384.

The previous prime is 256902493667. The next prime is 256902493723. The reversal of 256902493679 is 976394209652.

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 256902493679 - 2¹⁶ = 256902428143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256902493619) 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, 9880865129 + ... + 9880865154.

It is an arithmetic number, because the mean of its divisors is an integer number (69166055994).

Almost surely, 2^256902493679 is an apocalyptic number.

256902493679 is a deficient number, since it is larger than the sum of its proper divisors (19761730297).

256902493679 is a wasteful number, since it uses less digits than its factorization.

256902493679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19761730296.

The product of its (nonzero) digits is 44089920, while the sum is 62.

The spelling of 256902493679 in words is "two hundred fifty-six billion, nine hundred two million, four hundred ninety-three thousand, six hundred seventy-nine".