18665562 has 16 divisors (see below), whose sum is σ = 39296160. Its totient is φ = 5894352.

The previous prime is 18665551. The next prime is 18665587. The reversal of 18665562 is 26556681.

It is a self number, because there is not a number n which added to its sum of digits gives 18665562.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81753 + ... + 81980.

It is an arithmetic number, because the mean of its divisors is an integer number (2456010).

Almost surely, 2^18665562 is an apocalyptic number.

18665562 is an abundant number, since it is smaller than the sum of its proper divisors (20630598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18665562 is a wasteful number, since it uses less digits than its factorization.

18665562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163757.

The product of its digits is 86400, while the sum is 39.

The square root of 18665562 is about 4320.3659567217. The cubic root of 18665562 is about 265.2652476472.

The spelling of 18665562 in words is "eighteen million, six hundred sixty-five thousand, five hundred sixty-two".