2256404243633 has 4 divisors (see below), whose sum is σ = 2259891731520. Its totient is φ = 2252916755748.

The previous prime is 2256404243609. The next prime is 2256404243701. The reversal of 2256404243633 is 3363424046522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2256404243633 - 2⁸ = 2256404243377 is a prime.

It is a super-2 number, since 2×2256404243633² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256404243603) 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, 1743742973 + ... + 1743744266.

It is an arithmetic number, because the mean of its divisors is an integer number (564972932880).

Almost surely, 2^{2256404243633} is an apocalyptic number.

It is an amenable number.

2256404243633 is a deficient number, since it is larger than the sum of its proper divisors (3487487887).

2256404243633 is an equidigital number, since it uses as much as digits as its factorization.

2256404243633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487487886.

The product of its (nonzero) digits is 2488320, while the sum is 44.

The spelling of 2256404243633 in words is "two trillion, two hundred fifty-six billion, four hundred four million, two hundred forty-three thousand, six hundred thirty-three".