18885986331677 has 2 divisors, whose sum is σ = 18885986331678. Its totient is φ = 18885986331676.

The previous prime is 18885986331581. The next prime is 18885986331767. The reversal of 18885986331677 is 77613368958881.

Together with next prime (18885986331767) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17727964990681 + 1158021340996 = 4210459^2 + 1076114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18885986331677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18885986336677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442993165838 + 9442993165839.

It is an arithmetic number, because the mean of its divisors is an integer number (9442993165839).

Almost surely, 2^{18885986331677} is an apocalyptic number.

It is an amenable number.

18885986331677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885986331677 is an equidigital number, since it uses as much as digits as its factorization.

18885986331677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2926264320, while the sum is 80.

The spelling of 18885986331677 in words is "eighteen trillion, eight hundred eighty-five billion, nine hundred eighty-six million, three hundred thirty-one thousand, six hundred seventy-seven".