18572561279 has 4 divisors (see below), whose sum is σ = 18573384720. Its totient is φ = 18571737840.

The previous prime is 18572561257. The next prime is 18572561297. The reversal of 18572561279 is 97216527581.

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-18572561279 is a prime.

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 18572561279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18572561299) 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, 376907 + ... + 423324.

It is an arithmetic number, because the mean of its divisors is an integer number (4643346180).

Almost surely, 2^18572561279 is an apocalyptic number.

18572561279 is a deficient number, since it is larger than the sum of its proper divisors (823441).

18572561279 is an equidigital number, since it uses as much as digits as its factorization.

18572561279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823440.

The product of its digits is 2116800, while the sum is 53.

The spelling of 18572561279 in words is "eighteen billion, five hundred seventy-two million, five hundred sixty-one thousand, two hundred seventy-nine".