18638491292 has 6 divisors (see below), whose sum is σ = 32617359768. Its totient is φ = 9319245644.

The previous prime is 18638491283. The next prime is 18638491321. The reversal of 18638491292 is 29219483681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2329811408 + ... + 2329811415.

It is an arithmetic number, because the mean of its divisors is an integer number (5436226628).

Almost surely, 2^18638491292 is an apocalyptic number.

It is an amenable number.

18638491292 is a deficient number, since it is larger than the sum of its proper divisors (13978868476).

18638491292 is a wasteful number, since it uses less digits than its factorization.

18638491292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659622827 (or 4659622825 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 53.

The spelling of 18638491292 in words is "eighteen billion, six hundred thirty-eight million, four hundred ninety-one thousand, two hundred ninety-two".