256733454271331 has 4 divisors (see below), whose sum is σ = 256733525165712. Its totient is φ = 256733383376952.

The previous prime is 256733454271303. The next prime is 256733454271361. The reversal of 256733454271331 is 133172454337652.

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 256733454271331 - 2²⁶ = 256733387162467 is a prime.

It is a super-2 number, since 2×256733454271331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256733454271361) 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, 29705111 + ... + 37361216.

It is an arithmetic number, because the mean of its divisors is an integer number (64183381291428).

Almost surely, 2^{256733454271331} is an apocalyptic number.

256733454271331 is a deficient number, since it is larger than the sum of its proper divisors (70894381).

256733454271331 is an equidigital number, since it uses as much as digits as its factorization.

256733454271331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70894380.

The product of its digits is 38102400, while the sum is 56.

The spelling of 256733454271331 in words is "two hundred fifty-six trillion, seven hundred thirty-three billion, four hundred fifty-four million, two hundred seventy-one thousand, three hundred thirty-one".