18466815907 has 4 divisors (see below), whose sum is σ = 18769550656. Its totient is φ = 18164081160.

The previous prime is 18466815883. The next prime is 18466815911. The reversal of 18466815907 is 70951866481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18466815907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18466815967) 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 3 ways as a sum of consecutive naturals, for example, 151367283 + ... + 151367404.

It is an arithmetic number, because the mean of its divisors is an integer number (4692387664).

Almost surely, 2^18466815907 is an apocalyptic number.

18466815907 is a deficient number, since it is larger than the sum of its proper divisors (302734749).

18466815907 is an equidigital number, since it uses as much as digits as its factorization.

18466815907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302734748.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 18466815907 in words is "eighteen billion, four hundred sixty-six million, eight hundred fifteen thousand, nine hundred seven".