18500550520 has 16 divisors (see below), whose sum is σ = 41626238760. Its totient is φ = 7400220192.

The previous prime is 18500550469. The next prime is 18500550521. The reversal of 18500550520 is 2505500581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500550521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231256842 + ... + 231256921.

Almost surely, 2^18500550520 is an apocalyptic number.

18500550520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18500550520 is an abundant number, since it is smaller than the sum of its proper divisors (23125688240).

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

18500550520 is a wasteful number, since it uses less digits than its factorization.

18500550520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462513774 (or 462513770 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 18500550520 in words is "eighteen billion, five hundred million, five hundred fifty thousand, five hundred twenty".