18279991252 has 12 divisors (see below), whose sum is σ = 31991020096. Its totient is φ = 9139699800.

The previous prime is 18279991199. The next prime is 18279991273. The reversal of 18279991252 is 25219997281.

It is a junction number, because it is equal to n+sod(n) for n = 18279991193 and 18279991202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123877 + ... + 227827.

Almost surely, 2^18279991252 is an apocalyptic number.

It is an amenable number.

18279991252 is a deficient number, since it is larger than the sum of its proper divisors (13711028844).

18279991252 is a wasteful number, since it uses less digits than its factorization.

18279991252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147918 (or 147916 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 55.

The spelling of 18279991252 in words is "eighteen billion, two hundred seventy-nine million, nine hundred ninety-one thousand, two hundred fifty-two".