256477633144646 has 8 divisors (see below), whose sum is σ = 384725098467864. Its totient is φ = 128235933655360.

The previous prime is 256477633144627. The next prime is 256477633144727. The reversal of 256477633144646 is 646441336774652.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441347275 + ... + 1441525206.

It is an arithmetic number, because the mean of its divisors is an integer number (48090637308483).

Almost surely, 2^{256477633144646} is an apocalyptic number.

256477633144646 is a deficient number, since it is larger than the sum of its proper divisors (128247465323218).

256477633144646 is a wasteful number, since it uses less digits than its factorization.

256477633144646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882916966.

The product of its digits is 1463132160, while the sum is 68.

The spelling of 256477633144646 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, six hundred thirty-three million, one hundred forty-four thousand, six hundred forty-six".