18681674160977 has 2 divisors, whose sum is σ = 18681674160978. Its totient is φ = 18681674160976.

The previous prime is 18681674160913. The next prime is 18681674160991. The reversal of 18681674160977 is 77906147618681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14714251559056 + 3967422601921 = 3835916^2 + 1991839^2 .

It is a cyclic number.

It is not a de Polignac number, because 18681674160977 - 2⁶ = 18681674160913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18681674160977.

It is not a weakly prime, because it can be changed into another prime (18681674160577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9340837080488 + 9340837080489.

It is an arithmetic number, because the mean of its divisors is an integer number (9340837080489).

Almost surely, 2^{18681674160977} is an apocalyptic number.

It is an amenable number.

18681674160977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18681674160977 is an equidigital number, since it uses as much as digits as its factorization.

18681674160977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170698752, while the sum is 71.

The spelling of 18681674160977 in words is "eighteen trillion, six hundred eighty-one billion, six hundred seventy-four million, one hundred sixty thousand, nine hundred seventy-seven".