256623203220433 has 4 divisors (see below), whose sum is σ = 293283660823360. Its totient is φ = 219962745617508.

The previous prime is 256623203220407. The next prime is 256623203220457. The reversal of 256623203220433 is 334022302326652.

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 256623203220433 - 2⁵ = 256623203220401 is a prime.

It is a super-2 number, since 2×256623203220433² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256623203220433.

It is not an unprimeable number, because it can be changed into a prime (256623203221433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18330228801453 + ... + 18330228801466.

It is an arithmetic number, because the mean of its divisors is an integer number (73320915205840).

Almost surely, 2^{256623203220433} is an apocalyptic number.

It is an amenable number.

256623203220433 is a deficient number, since it is larger than the sum of its proper divisors (36660457602927).

256623203220433 is an equidigital number, since it uses as much as digits as its factorization.

256623203220433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36660457602926.

The product of its (nonzero) digits is 1866240, while the sum is 43.

The spelling of 256623203220433 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, two hundred three million, two hundred twenty thousand, four hundred thirty-three".