18366701985 has 24 divisors (see below), whose sum is σ = 32144708544. Its totient is φ = 9700469280.

The previous prime is 18366701963. The next prime is 18366701993. The reversal of 18366701985 is 58910766381.

It is not a de Polignac number, because 18366701985 - 2²⁰ = 18365653409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1976671 + ... + 1985940.

It is an arithmetic number, because the mean of its divisors is an integer number (1339362856).

Almost surely, 2^18366701985 is an apocalyptic number.

18366701985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18366701985 is a deficient number, since it is larger than the sum of its proper divisors (13778006559).

18366701985 is a wasteful number, since it uses less digits than its factorization.

18366701985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962725 (or 3962722 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 18366701985 in words is "eighteen billion, three hundred sixty-six million, seven hundred one thousand, nine hundred eighty-five".