256944667147 has 4 divisors (see below), whose sum is σ = 293651048176. Its totient is φ = 220238286120.

The previous prime is 256944667121. The next prime is 256944667201. The reversal of 256944667147 is 741766449652.

It is a happy number.

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 256944667147 - 2³⁵ = 222584928779 is a prime.

It is a super-2 number, since 2×256944667147² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256944667547) 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, 18353190504 + ... + 18353190517.

It is an arithmetic number, because the mean of its divisors is an integer number (73412762044).

Almost surely, 2^256944667147 is an apocalyptic number.

256944667147 is a deficient number, since it is larger than the sum of its proper divisors (36706381029).

256944667147 is an equidigital number, since it uses as much as digits as its factorization.

256944667147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36706381028.

The product of its digits is 60963840, while the sum is 61.

The spelling of 256944667147 in words is "two hundred fifty-six billion, nine hundred forty-four million, six hundred sixty-seven thousand, one hundred forty-seven".