18906713608 has 16 divisors (see below), whose sum is σ = 37535387580. Its totient is φ = 8897276928.

The previous prime is 18906713599. The next prime is 18906713627. The reversal of 18906713608 is 80631760981.

It can be written as a sum of positive squares in 2 ways, for example, as 18398752164 + 507961444 = 135642^2 + 22538^2 .

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, 69509841 + ... + 69510112.

Almost surely, 2^18906713608 is an apocalyptic number.

It is an amenable number.

18906713608 is a deficient number, since it is larger than the sum of its proper divisors (18628673972).

18906713608 is a wasteful number, since it uses less digits than its factorization.

18906713608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139019976 (or 139019972 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 18906713608 in words is "eighteen billion, nine hundred six million, seven hundred thirteen thousand, six hundred eight".