18486868158661 has 8 divisors (see below), whose sum is σ = 21131197156224. Its totient is φ = 15843376119120.

The previous prime is 18486868158641. The next prime is 18486868158667. The reversal of 18486868158661 is 16685186868481.

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

It is a cyclic number.

It is not a de Polignac number, because 18486868158661 - 2¹⁹ = 18486867634373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18486868158667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209192170 + ... + 209280523.

It is an arithmetic number, because the mean of its divisors is an integer number (2641399644528).

Almost surely, 2^{18486868158661} is an apocalyptic number.

It is an amenable number.

18486868158661 is a deficient number, since it is larger than the sum of its proper divisors (2644328997563).

18486868158661 is an equidigital number, since it uses as much as digits as its factorization.

18486868158661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418479011.

The product of its digits is 849346560, while the sum is 76.

The spelling of 18486868158661 in words is "eighteen trillion, four hundred eighty-six billion, eight hundred sixty-eight million, one hundred fifty-eight thousand, six hundred sixty-one".