18166559464 has 8 divisors (see below), whose sum is σ = 34062299010. Its totient is φ = 9083279728.

The previous prime is 18166559459. The next prime is 18166559473. The reversal of 18166559464 is 46495566181.

It can be written as a sum of positive squares in only one way, i.e., 16450114564 + 1716444900 = 128258^2 + 41430^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×18166559464³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

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, 1135409959 + ... + 1135409974.

Almost surely, 2^18166559464 is an apocalyptic number.

It is an amenable number.

18166559464 is a deficient number, since it is larger than the sum of its proper divisors (15895739546).

18166559464 is a wasteful number, since it uses less digits than its factorization.

18166559464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270819939 (or 2270819935 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 55.

The spelling of 18166559464 in words is "eighteen billion, one hundred sixty-six million, five hundred fifty-nine thousand, four hundred sixty-four".