18660858315087 has 4 divisors (see below), whose sum is σ = 24881144420120. Its totient is φ = 12440572210056.

The previous prime is 18660858315067. The next prime is 18660858315091. The reversal of 18660858315087 is 78051385806681.

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

It is not a de Polignac number, because 18660858315087 - 2⁸ = 18660858314831 is a prime.

It is a super-4 number, since 4×18660858315087⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18660858315037) 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, 3110143052512 + ... + 3110143052517.

It is an arithmetic number, because the mean of its divisors is an integer number (6220286105030).

Almost surely, 2^{18660858315087} is an apocalyptic number.

18660858315087 is a deficient number, since it is larger than the sum of its proper divisors (6220286105033).

18660858315087 is an equidigital number, since it uses as much as digits as its factorization.

18660858315087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220286105032.

The product of its (nonzero) digits is 77414400, while the sum is 66.

The spelling of 18660858315087 in words is "eighteen trillion, six hundred sixty billion, eight hundred fifty-eight million, three hundred fifteen thousand, eighty-seven".