256667877376 has 51 divisors (see below), whose sum is σ = 513591358891. Its totient is φ = 128269090816.

The previous prime is 256667877373. The next prime is 256667877379. The reversal of 256667877376 is 673778766652.

The square root of 256667877376 is 506624.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (256667877373) and next prime (256667877379).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256667877373) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 129694755 + ... + 129696733.

Almost surely, 2^256667877376 is an apocalyptic number.

256667877376 is the 506624-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256667877376

256667877376 is an abundant number, since it is smaller than the sum of its proper divisors (256923481515).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256667877376 is an frugal number, since it uses more digits than its factorization.

256667877376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 1981 counting only the distinct ones).

The product of its digits is 746807040, while the sum is 70.

The spelling of 256667877376 in words is "two hundred fifty-six billion, six hundred sixty-seven million, eight hundred seventy-seven thousand, three hundred seventy-six".