18408537893 has 16 divisors (see below), whose sum is σ = 19652444160. Its totient is φ = 17214865200.

The previous prime is 18408537883. The next prime is 18408537913. The reversal of 18408537893 is 39873580481.

It is a cyclic number.

It is not a de Polignac number, because 18408537893 - 2²⁸ = 18140102437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408537863) 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, 35138 + ... + 195068.

It is an arithmetic number, because the mean of its divisors is an integer number (1228277760).

Almost surely, 2^18408537893 is an apocalyptic number.

It is an amenable number.

18408537893 is a deficient number, since it is larger than the sum of its proper divisors (1243906267).

18408537893 is a wasteful number, since it uses less digits than its factorization.

18408537893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160088.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 18408537893 in words is "eighteen billion, four hundred eight million, five hundred thirty-seven thousand, eight hundred ninety-three".