18666701867020 has 24 divisors (see below), whose sum is σ = 39200227917984. Its totient is φ = 7466651414016.

The previous prime is 18666701867003. The next prime is 18666701867053. The reversal of 18666701867020 is 2076810766681.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808444 + ... + 7199836.

It is an arithmetic number, because the mean of its divisors is an integer number (1633342829916).

Almost surely, 2^{18666701867020} is an apocalyptic number.

18666701867020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18666701867020 is an abundant number, since it is smaller than the sum of its proper divisors (20533526050964).

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

18666701867020 is a wasteful number, since it uses less digits than its factorization.

18666701867020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3666609 (or 3666607 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 18666701867020 in words is "eighteen trillion, six hundred sixty-six billion, seven hundred one million, eight hundred sixty-seven thousand, twenty".