18885201700520 has 16 divisors (see below), whose sum is σ = 42491703826260. Its totient is φ = 7554080680192.

The previous prime is 18885201700493. The next prime is 18885201700537. The reversal of 18885201700520 is 2500710258881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17122398478084 + 1762803222436 = 4137922^2 + 1327706^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236065021217 + ... + 236065021296.

Almost surely, 2^{18885201700520} is an apocalyptic number.

18885201700520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18885201700520 is an abundant number, since it is smaller than the sum of its proper divisors (23606502125740).

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

18885201700520 is a wasteful number, since it uses less digits than its factorization.

18885201700520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472130042524 (or 472130042520 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 47.

The spelling of 18885201700520 in words is "eighteen trillion, eight hundred eighty-five billion, two hundred one million, seven hundred thousand, five hundred twenty".