18163664 has 10 divisors (see below), whose sum is σ = 35192130. Its totient is φ = 9081824.

The previous prime is 18163661. The next prime is 18163669. The reversal of 18163664 is 46636181.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 7795264 = 3220^2 + 2792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163661) by changing a digit.

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 as a sum of consecutive naturals, namely, 567599 + ... + 567630.

It is an arithmetic number, because the mean of its divisors is an integer number (3519213).

Almost surely, 2^18163664 is an apocalyptic number.

It is an amenable number.

18163664 is a deficient number, since it is larger than the sum of its proper divisors (17028466).

18163664 is a wasteful number, since it uses less digits than its factorization.

18163664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135237 (or 1135231 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 18163664 is about 4261.8850289514. The cubic root of 18163664 is about 262.8660423218.

The spelling of 18163664 in words is "eighteen million, one hundred sixty-three thousand, six hundred sixty-four".