18645878332 has 6 divisors (see below), whose sum is σ = 32630287088. Its totient is φ = 9322939164.

The previous prime is 18645878299. The next prime is 18645878347. The reversal of 18645878332 is 23387854681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330734788 + ... + 2330734795.

Almost surely, 2^18645878332 is an apocalyptic number.

It is an amenable number.

18645878332 is a deficient number, since it is larger than the sum of its proper divisors (13984408756).

18645878332 is a wasteful number, since it uses less digits than its factorization.

18645878332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661469587 (or 4661469585 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 55.

The spelling of 18645878332 in words is "eighteen billion, six hundred forty-five million, eight hundred seventy-eight thousand, three hundred thirty-two".