18940484571 has 8 divisors (see below), whose sum is σ = 26583136320. Its totient is φ = 11962411272.

The previous prime is 18940484557. The next prime is 18940484579. The reversal of 18940484571 is 17548404981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18940484571 - 2²² = 18936290267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18940484579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166144545 + ... + 166144658.

It is an arithmetic number, because the mean of its divisors is an integer number (3322892040).

Almost surely, 2^18940484571 is an apocalyptic number.

18940484571 is a deficient number, since it is larger than the sum of its proper divisors (7642651749).

18940484571 is a wasteful number, since it uses less digits than its factorization.

18940484571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332289225.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 18940484571 in words is "eighteen billion, nine hundred forty million, four hundred eighty-four thousand, five hundred seventy-one".