18693985086 has 32 divisors (see below), whose sum is σ = 47476788480. Its totient is φ = 5341138488.

The previous prime is 18693985073. The next prime is 18693985097. The reversal of 18693985086 is 68058939681.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24727116 + ... + 24727871.

It is an arithmetic number, because the mean of its divisors is an integer number (1483649640).

Almost surely, 2^18693985086 is an apocalyptic number.

18693985086 is an abundant number, since it is smaller than the sum of its proper divisors (28782803394).

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

18693985086 is a wasteful number, since it uses less digits than its factorization.

18693985086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49455005 (or 49454999 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 18693985086 in words is "eighteen billion, six hundred ninety-three million, nine hundred eighty-five thousand, eighty-six".