18651779216 has 40 divisors (see below), whose sum is σ = 41382601344. Its totient is φ = 7977703680.

The previous prime is 18651779213. The next prime is 18651779221. The reversal of 18651779216 is 61297715681.

It is not an unprimeable number, because it can be changed into a prime (18651779213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109205 + ... + 221876.

Almost surely, 2^18651779216 is an apocalyptic number.

18651779216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18651779216 is an abundant number, since it is smaller than the sum of its proper divisors (22730822128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18651779216 is a wasteful number, since it uses less digits than its factorization.

18651779216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331599 (or 331593 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 53.

The spelling of 18651779216 in words is "eighteen billion, six hundred fifty-one million, seven hundred seventy-nine thousand, two hundred sixteen".