18877059917 has 2 divisors, whose sum is σ = 18877059918. Its totient is φ = 18877059916.

The previous prime is 18877059907. The next prime is 18877059937. The reversal of 18877059917 is 71995077881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9977212996 + 8899846921 = 99886^2 + 94339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18877059917 is a prime.

It is a super-2 number, since 2×18877059917² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18877059917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18877059907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9438529958 + 9438529959.

It is an arithmetic number, because the mean of its divisors is an integer number (9438529959).

Almost surely, 2^18877059917 is an apocalyptic number.

It is an amenable number.

18877059917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18877059917 is an equidigital number, since it uses as much as digits as its factorization.

18877059917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8890560, while the sum is 62.

The spelling of 18877059917 in words is "eighteen billion, eight hundred seventy-seven million, fifty-nine thousand, nine hundred seventeen".