18636818685 has 8 divisors (see below), whose sum is σ = 29818909920. Its totient is φ = 9939636624.

The previous prime is 18636818677. The next prime is 18636818699. The reversal of 18636818685 is 58681863681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18636818685 - 2³ = 18636818677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621227275 + ... + 621227304.

It is an arithmetic number, because the mean of its divisors is an integer number (3727363740).

Almost surely, 2^18636818685 is an apocalyptic number.

18636818685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18636818685 is a deficient number, since it is larger than the sum of its proper divisors (11182091235).

18636818685 is a wasteful number, since it uses less digits than its factorization.

18636818685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242454587.

The product of its digits is 13271040, while the sum is 60.

The spelling of 18636818685 in words is "eighteen billion, six hundred thirty-six million, eight hundred eighteen thousand, six hundred eighty-five".