18664257305 has 8 divisors (see below), whose sum is σ = 22411940544. Its totient is φ = 14921518000.

The previous prime is 18664257301. The next prime is 18664257307. The reversal of 18664257305 is 50375246681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18664257305 - 2² = 18664257301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18664257305.

It is not an unprimeable number, because it can be changed into a prime (18664257301) 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 in 7 ways as a sum of consecutive naturals, for example, 1227671 + ... + 1242780.

It is an arithmetic number, because the mean of its divisors is an integer number (2801492568).

Almost surely, 2^18664257305 is an apocalyptic number.

It is an amenable number.

18664257305 is a deficient number, since it is larger than the sum of its proper divisors (3747683239).

18664257305 is a wasteful number, since it uses less digits than its factorization.

18664257305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471967.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 18664257305 in words is "eighteen billion, six hundred sixty-four million, two hundred fifty-seven thousand, three hundred five".