18361500420 has 48 divisors (see below), whose sum is σ = 54436451328. Its totient is φ = 4608376320.

The previous prime is 18361500397. The next prime is 18361500427. The reversal of 18361500420 is 2400516381.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18361500427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8999716 + ... + 9001755.

It is an arithmetic number, because the mean of its divisors is an integer number (1134092736).

Almost surely, 2^18361500420 is an apocalyptic number.

18361500420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18361500420 is an abundant number, since it is smaller than the sum of its proper divisors (36074950908).

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

18361500420 is a wasteful number, since it uses less digits than its factorization.

18361500420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18001500 (or 18001498 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 18361500420 in words is "eighteen billion, three hundred sixty-one million, five hundred thousand, four hundred twenty".