18900370068521 has 16 divisors (see below), whose sum is σ = 19144015113600. Its totient is φ = 18658001585280.

The previous prime is 18900370068511. The next prime is 18900370068551. The reversal of 18900370068521 is 12586007300981.

It is a cyclic number.

It is not a de Polignac number, because 18900370068521 - 2³⁴ = 18883190199337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18900370068521.

It is not an unprimeable number, because it can be changed into a prime (18900370068511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114690035 + ... + 114854711.

It is an arithmetic number, because the mean of its divisors is an integer number (1196500944600).

Almost surely, 2^{18900370068521} is an apocalyptic number.

It is an amenable number.

18900370068521 is a deficient number, since it is larger than the sum of its proper divisors (243645045079).

18900370068521 is a wasteful number, since it uses less digits than its factorization.

18900370068521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168544.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 18900370068521 in words is "eighteen trillion, nine hundred billion, three hundred seventy million, sixty-eight thousand, five hundred twenty-one".