18386722046 has 32 divisors (see below), whose sum is σ = 35494778880. Its totient is φ = 6932570400.

The previous prime is 18386722027. The next prime is 18386722069. The reversal of 18386722046 is 64022768381.

It is a super-2 number, since 2×18386722046² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1920941 + ... + 1930488.

It is an arithmetic number, because the mean of its divisors is an integer number (1109211840).

Almost surely, 2^18386722046 is an apocalyptic number.

18386722046 is a deficient number, since it is larger than the sum of its proper divisors (17108056834).

18386722046 is a wasteful number, since it uses less digits than its factorization.

18386722046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851480.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 18386722046 in words is "eighteen billion, three hundred eighty-six million, seven hundred twenty-two thousand, forty-six".