18635900372 has 6 divisors (see below), whose sum is σ = 32612825658. Its totient is φ = 9317950184.

The previous prime is 18635900347. The next prime is 18635900401. The reversal of 18635900372 is 27300953681.

It can be written as a sum of positive squares in only one way, i.e., 18622969156 + 12931216 = 136466^2 + 3596^2 .

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, 2329487543 + ... + 2329487550.

It is an arithmetic number, because the mean of its divisors is an integer number (5435470943).

Almost surely, 2^18635900372 is an apocalyptic number.

It is an amenable number.

18635900372 is a deficient number, since it is larger than the sum of its proper divisors (13976925286).

18635900372 is a wasteful number, since it uses less digits than its factorization.

18635900372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658975097 (or 4658975095 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 18635900372 in words is "eighteen billion, six hundred thirty-five million, nine hundred thousand, three hundred seventy-two".