18319606417 has 4 divisors (see below), whose sum is σ = 20936693056. Its totient is φ = 15702519780.

The previous prime is 18319606339. The next prime is 18319606427. The reversal of 18319606417 is 71460691381.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18319606417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18319606427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1308543309 + ... + 1308543322.

It is an arithmetic number, because the mean of its divisors is an integer number (5234173264).

Almost surely, 2^18319606417 is an apocalyptic number.

It is an amenable number.

18319606417 is a deficient number, since it is larger than the sum of its proper divisors (2617086639).

18319606417 is an equidigital number, since it uses as much as digits as its factorization.

18319606417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617086638.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 18319606417 in words is "eighteen billion, three hundred nineteen million, six hundred six thousand, four hundred seventeen".