256851302399 has 4 divisors (see below), whose sum is σ = 257917075680. Its totient is φ = 255785529120.

The previous prime is 256851302377. The next prime is 256851302401. The reversal of 256851302399 is 993203158652.

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 256851302399 - 2³² = 252556335103 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 256851302399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256851302339) 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, 532886279 + ... + 532886760.

It is an arithmetic number, because the mean of its divisors is an integer number (64479268920).

Almost surely, 2^256851302399 is an apocalyptic number.

256851302399 is a deficient number, since it is larger than the sum of its proper divisors (1065773281).

256851302399 is a wasteful number, since it uses less digits than its factorization.

256851302399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065773280.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 256851302399 in words is "two hundred fifty-six billion, eight hundred fifty-one million, three hundred two thousand, three hundred ninety-nine".