18906418817 has 16 divisors (see below), whose sum is σ = 22216747392. Its totient is φ = 15861947520.

The previous prime is 18906418801. The next prime is 18906418829. The reversal of 18906418817 is 71881460981.

It is a cyclic number.

It is not a de Polignac number, because 18906418817 - 2⁴ = 18906418801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18906418877) 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, 762428 + ... + 786834.

It is an arithmetic number, because the mean of its divisors is an integer number (1388546712).

Almost surely, 2^18906418817 is an apocalyptic number.

It is an amenable number.

18906418817 is a deficient number, since it is larger than the sum of its proper divisors (3310328575).

18906418817 is a wasteful number, since it uses less digits than its factorization.

18906418817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29848.

The product of its (nonzero) digits is 774144, while the sum is 53.

The spelling of 18906418817 in words is "eighteen billion, nine hundred six million, four hundred eighteen thousand, eight hundred seventeen".