256469379709 has 8 divisors (see below), whose sum is σ = 263536205400. Its totient is φ = 249409670976.

The previous prime is 256469379671. The next prime is 256469379773. The reversal of 256469379709 is 907973964652.

It can be written as a sum of positive squares in 4 ways, for example, as 182769075225 + 73700304484 = 427515^2 + 271478^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 256469379709 - 2²⁷ = 256335161981 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 (256469370709) 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, 1706134 + ... + 1850359.

It is an arithmetic number, because the mean of its divisors is an integer number (32942025675).

Almost surely, 2^256469379709 is an apocalyptic number.

It is an amenable number.

256469379709 is a deficient number, since it is larger than the sum of its proper divisors (7066825691).

256469379709 is a wasteful number, since it uses less digits than its factorization.

256469379709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558479.

The product of its (nonzero) digits is 154314720, while the sum is 67.

The spelling of 256469379709 in words is "two hundred fifty-six billion, four hundred sixty-nine million, three hundred seventy-nine thousand, seven hundred nine".