18456416993 has 16 divisors (see below), whose sum is σ = 21802235520. Its totient is φ = 15296688000.

The previous prime is 18456416983. The next prime is 18456417061. The reversal of 18456416993 is 39961465481.

It is a cyclic number.

It is not a de Polignac number, because 18456416993 - 2¹⁶ = 18456351457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18456416983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341108 + ... + 391493.

It is an arithmetic number, because the mean of its divisors is an integer number (1362639720).

Almost surely, 2^18456416993 is an apocalyptic number.

It is an amenable number.

18456416993 is a deficient number, since it is larger than the sum of its proper divisors (3345818527).

18456416993 is an equidigital number, since it uses as much as digits as its factorization.

18456416993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732728.

The product of its digits is 5598720, while the sum is 56.

The spelling of 18456416993 in words is "eighteen billion, four hundred fifty-six million, four hundred sixteen thousand, nine hundred ninety-three".