18864515242 has 4 divisors (see below), whose sum is σ = 28296772866. Its totient is φ = 9432257620.

The previous prime is 18864515233. The next prime is 18864515309. The reversal of 18864515242 is 24251546881.

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

It can be written as a sum of positive squares in only one way, i.e., 16425241921 + 2439273321 = 128161^2 + 49389^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18864515192 and 18864515201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4716128809 + ... + 4716128812.

Almost surely, 2^18864515242 is an apocalyptic number.

18864515242 is a deficient number, since it is larger than the sum of its proper divisors (9432257624).

18864515242 is an equidigital number, since it uses as much as digits as its factorization.

18864515242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9432257623.

The product of its digits is 614400, while the sum is 46.

The spelling of 18864515242 in words is "eighteen billion, eight hundred sixty-four million, five hundred fifteen thousand, two hundred forty-two".