18520377244 has 12 divisors (see below), whose sum is σ = 33456165568. Its totient is φ = 8961472800.

The previous prime is 18520377217. The next prime is 18520377263. The reversal of 18520377244 is 44277302581.

It is a self number, because there is not a number n which added to its sum of digits gives 18520377244.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74678817 + ... + 74679064.

Almost surely, 2^18520377244 is an apocalyptic number.

It is an amenable number.

18520377244 is a deficient number, since it is larger than the sum of its proper divisors (14935788324).

18520377244 is a wasteful number, since it uses less digits than its factorization.

18520377244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149357916 (or 149357914 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 18520377244 in words is "eighteen billion, five hundred twenty million, three hundred seventy-seven thousand, two hundred forty-four".