18993065406 has 32 divisors (see below), whose sum is σ = 43860284160. Its totient is φ = 5370644736.

The previous prime is 18993065401. The next prime is 18993065407. The reversal of 18993065406 is 60456039981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18993065401) 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, 2326936 + ... + 2335083.

It is an arithmetic number, because the mean of its divisors is an integer number (1370633880).

Almost surely, 2^18993065406 is an apocalyptic number.

18993065406 is an abundant number, since it is smaller than the sum of its proper divisors (24867218754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18993065406 is a wasteful number, since it uses less digits than its factorization.

18993065406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662128.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 18993065406 in words is "eighteen billion, nine hundred ninety-three million, sixty-five thousand, four hundred six".