256629999947 has 8 divisors (see below), whose sum is σ = 267569702400. Its totient is φ = 245829657024.

The previous prime is 256629999937. The next prime is 256629999949. The reversal of 256629999947 is 749999926652.

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 256629999947 - 2²² = 256625805643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256629999949) 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, 34836122 + ... + 34843487.

It is an arithmetic number, because the mean of its divisors is an integer number (33446212800).

Almost surely, 2^256629999947 is an apocalyptic number.

256629999947 is a deficient number, since it is larger than the sum of its proper divisors (10939702453).

256629999947 is a wasteful number, since it uses less digits than its factorization.

256629999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69679765.

The product of its digits is 1190427840, while the sum is 77.

The spelling of 256629999947 in words is "two hundred fifty-six billion, six hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".