18939555385177 has 16 divisors (see below), whose sum is σ = 23249415856000. Its totient is φ = 15379488578160.

The previous prime is 18939555385073. The next prime is 18939555385187. The reversal of 18939555385177 is 77158355593981.

It is a de Polignac number, because none of the positive numbers 2^k-18939555385177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18939555385187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1453081974 + ... + 1453095007.

It is an arithmetic number, because the mean of its divisors is an integer number (1453088491000).

Almost surely, 2^{18939555385177} is an apocalyptic number.

It is an amenable number.

18939555385177 is a deficient number, since it is larger than the sum of its proper divisors (4309860470823).

18939555385177 is an equidigital number, since it uses as much as digits as its factorization.

18939555385177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906177021 (or 2906177007 counting only the distinct ones).

The product of its digits is 1428840000, while the sum is 76.

The spelling of 18939555385177 in words is "eighteen trillion, nine hundred thirty-nine billion, five hundred fifty-five million, three hundred eighty-five thousand, one hundred seventy-seven".