18168666645 has 16 divisors (see below), whose sum is σ = 29080670400. Its totient is φ = 9686354304.

The previous prime is 18168666631. The next prime is 18168666653. The reversal of 18168666645 is 54666686181.

It is not a de Polignac number, because 18168666645 - 2⁵ = 18168666613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183120 + ... + 264329.

It is an arithmetic number, because the mean of its divisors is an integer number (1817541900).

Almost surely, 2^18168666645 is an apocalyptic number.

18168666645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18168666645 is a deficient number, since it is larger than the sum of its proper divisors (10912003755).

18168666645 is a wasteful number, since it uses less digits than its factorization.

18168666645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450164.

The product of its digits is 9953280, while the sum is 57.

The spelling of 18168666645 in words is "eighteen billion, one hundred sixty-eight million, six hundred sixty-six thousand, six hundred forty-five".