256430553643 has 4 divisors (see below), whose sum is σ = 279742422168. Its totient is φ = 233118685120.

The previous prime is 256430553629. The next prime is 256430553677. The reversal of 256430553643 is 346355034652.

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 256430553643 - 2²⁹ = 255893682731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256430553593 and 256430553602.

It is not an unprimeable number, because it can be changed into a prime (256430556643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11655934246 + ... + 11655934267.

It is an arithmetic number, because the mean of its divisors is an integer number (69935605542).

Almost surely, 2^256430553643 is an apocalyptic number.

256430553643 is a deficient number, since it is larger than the sum of its proper divisors (23311868525).

256430553643 is a wasteful number, since it uses less digits than its factorization.

256430553643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23311868524.

The product of its (nonzero) digits is 3888000, while the sum is 46.

The spelling of 256430553643 in words is "two hundred fifty-six billion, four hundred thirty million, five hundred fifty-three thousand, six hundred forty-three".