18686868370187 has 4 divisors (see below), whose sum is σ = 19039450792320. Its totient is φ = 18334285948056.

The previous prime is 18686868370123. The next prime is 18686868370193. The reversal of 18686868370187 is 78107386868681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18686868370187 - 2⁶ = 18686868370123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18686868370087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176291210987 + ... + 176291211092.

It is an arithmetic number, because the mean of its divisors is an integer number (4759862698080).

Almost surely, 2^{18686868370187} is an apocalyptic number.

18686868370187 is a deficient number, since it is larger than the sum of its proper divisors (352582422133).

18686868370187 is an equidigital number, since it uses as much as digits as its factorization.

18686868370187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352582422132.

The product of its (nonzero) digits is 1040449536, while the sum is 77.

The spelling of 18686868370187 in words is "eighteen trillion, six hundred eighty-six billion, eight hundred sixty-eight million, three hundred seventy thousand, one hundred eighty-seven".