18986440635 has 16 divisors (see below), whose sum is σ = 33753672480. Its totient is φ = 10126101600.

The previous prime is 18986440579. The next prime is 18986440663. The reversal of 18986440635 is 53604468981.

It is not a de Polignac number, because 18986440635 - 2¹⁰ = 18986439611 is a prime.

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, 70320016 + ... + 70320285.

It is an arithmetic number, because the mean of its divisors is an integer number (2109604530).

Almost surely, 2^18986440635 is an apocalyptic number.

18986440635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18986440635 is a deficient number, since it is larger than the sum of its proper divisors (14767231845).

18986440635 is a wasteful number, since it uses less digits than its factorization.

18986440635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140640315 (or 140640309 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 18986440635 in words is "eighteen billion, nine hundred eighty-six million, four hundred forty thousand, six hundred thirty-five".