256630345553443 has 4 divisors (see below), whose sum is σ = 257214924928720. Its totient is φ = 256045766178168.

The previous prime is 256630345553423. The next prime is 256630345553471. The reversal of 256630345553443 is 344355543036652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256630345553443 is a prime.

It is a super-2 number, since 2×256630345553443² (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 (256630345553423) 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, 292289686980 + ... + 292289687857.

It is an arithmetic number, because the mean of its divisors is an integer number (64303731232180).

Almost surely, 2^{256630345553443} is an apocalyptic number.

256630345553443 is a deficient number, since it is larger than the sum of its proper divisors (584579375277).

256630345553443 is an equidigital number, since it uses as much as digits as its factorization.

256630345553443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584579375276.

The product of its (nonzero) digits is 233280000, while the sum is 58.

The spelling of 256630345553443 in words is "two hundred fifty-six trillion, six hundred thirty billion, three hundred forty-five million, five hundred fifty-three thousand, four hundred forty-three".