18581996177 has 2 divisors, whose sum is σ = 18581996178. Its totient is φ = 18581996176.

The previous prime is 18581996141. The next prime is 18581996201. The reversal of 18581996177 is 77169918581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14591673616 + 3990322561 = 120796^2 + 63169^2 .

It is a cyclic number.

It is not a de Polignac number, because 18581996177 - 2⁶ = 18581996113 is a prime.

It is not a weakly prime, because it can be changed into another prime (18581996137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9290998088 + 9290998089.

It is an arithmetic number, because the mean of its divisors is an integer number (9290998089).

Almost surely, 2^18581996177 is an apocalyptic number.

It is an amenable number.

18581996177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18581996177 is an equidigital number, since it uses as much as digits as its factorization.

18581996177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 62.

The spelling of 18581996177 in words is "eighteen billion, five hundred eighty-one million, nine hundred ninety-six thousand, one hundred seventy-seven".