18118564 has 6 divisors (see below), whose sum is σ = 31707494. Its totient is φ = 9059280.

The previous prime is 18118553. The next prime is 18118589. The reversal of 18118564 is 46581181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 5798464 = 3510^2 + 2408^2 .

It is a super-2 number, since 2×18118564² = 656564722844192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2264817 + ... + 2264824.

Almost surely, 2^18118564 is an apocalyptic number.

It is an amenable number.

18118564 is a deficient number, since it is larger than the sum of its proper divisors (13588930).

18118564 is a wasteful number, since it uses less digits than its factorization.

18118564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4529645 (or 4529643 counting only the distinct ones).

The product of its digits is 7680, while the sum is 34.

The square root of 18118564 is about 4256.5906545027. The cubic root of 18118564 is about 262.6482983654.

The spelling of 18118564 in words is "eighteen million, one hundred eighteen thousand, five hundred sixty-four".