18664361 has 4 divisors (see below), whose sum is σ = 18694032. Its totient is φ = 18634692.

The previous prime is 18664333. The next prime is 18664363. The reversal of 18664361 is 16346681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16346681 = 13 ⋅1257437.

It is a cyclic number.

It is not a de Polignac number, because 18664361 - 2⁶ = 18664297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18664363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13871 + ... + 15156.

It is an arithmetic number, because the mean of its divisors is an integer number (4673508).

Almost surely, 2^18664361 is an apocalyptic number.

It is an amenable number.

18664361 is a deficient number, since it is larger than the sum of its proper divisors (29671).

18664361 is an equidigital number, since it uses as much as digits as its factorization.

18664361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29670.

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

The square root of 18664361 is about 4320.2269616306. The cubic root of 18664361 is about 265.2595581963.

The spelling of 18664361 in words is "eighteen million, six hundred sixty-four thousand, three hundred sixty-one".