18877097557 has 2 divisors, whose sum is σ = 18877097558. Its totient is φ = 18877097556.

The previous prime is 18877097539. The next prime is 18877097573. The reversal of 18877097557 is 75579077881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14851321956 + 4025775601 = 121866^2 + 63449^2 .

It is a cyclic number.

It is not a de Polignac number, because 18877097557 - 2⁷ = 18877097429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18877097597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9438548778 + 9438548779.

It is an arithmetic number, because the mean of its divisors is an integer number (9438548779).

Almost surely, 2^18877097557 is an apocalyptic number.

It is an amenable number.

18877097557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18877097557 is an equidigital number, since it uses as much as digits as its factorization.

18877097557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34574400, while the sum is 64.

The spelling of 18877097557 in words is "eighteen billion, eight hundred seventy-seven million, ninety-seven thousand, five hundred fifty-seven".