18869910786 has 12 divisors (see below), whose sum is σ = 40884806742. Its totient is φ = 6289970256.

The previous prime is 18869910779. The next prime is 18869910803. The reversal of 18869910786 is 68701996881.

It can be written as a sum of positive squares in only one way, i.e., 17412122025 + 1457788761 = 131955^2 + 38181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 524164171 + ... + 524164206.

Almost surely, 2^18869910786 is an apocalyptic number.

18869910786 is an abundant number, since it is smaller than the sum of its proper divisors (22014895956).

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

18869910786 is a wasteful number, since it uses less digits than its factorization.

18869910786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048328385 (or 1048328382 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 18869910786 in words is "eighteen billion, eight hundred sixty-nine million, nine hundred ten thousand, seven hundred eighty-six".