18572797923 has 4 divisors (see below), whose sum is σ = 24763730568. Its totient is φ = 12381865280.

The previous prime is 18572797877. The next prime is 18572797927. The reversal of 18572797923 is 32979727581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32979727581 = 3 ⋅10993242527.

It is a cyclic number.

It is not a de Polignac number, because 18572797923 - 2²⁰ = 18571749347 is a prime.

It is a super-2 number, since 2×18572797923² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18572797927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3095466318 + ... + 3095466323.

It is an arithmetic number, because the mean of its divisors is an integer number (6190932642).

Almost surely, 2^18572797923 is an apocalyptic number.

18572797923 is a deficient number, since it is larger than the sum of its proper divisors (6190932645).

18572797923 is an equidigital number, since it uses as much as digits as its factorization.

18572797923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190932644.

The product of its digits is 13335840, while the sum is 60.

The spelling of 18572797923 in words is "eighteen billion, five hundred seventy-two million, seven hundred ninety-seven thousand, nine hundred twenty-three".