18071131577 has 2 divisors, whose sum is σ = 18071131578. Its totient is φ = 18071131576.

The previous prime is 18071131549. The next prime is 18071131627. The reversal of 18071131577 is 77513117081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16467048976 + 1604082601 = 128324^2 + 40051^2 .

It is an emirp because it is prime and its reverse (77513117081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18071131577 - 2²⁰ = 18070083001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18071131777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035565788 + 9035565789.

It is an arithmetic number, because the mean of its divisors is an integer number (9035565789).

Almost surely, 2^18071131577 is an apocalyptic number.

It is an amenable number.

18071131577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18071131577 is an equidigital number, since it uses as much as digits as its factorization.

18071131577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 41.

The spelling of 18071131577 in words is "eighteen billion, seventy-one million, one hundred thirty-one thousand, five hundred seventy-seven".