18489412156621 has 16 divisors (see below), whose sum is σ = 21415507344000. Its totient is φ = 15635043246528.

The previous prime is 18489412156591. The next prime is 18489412156639. The reversal of 18489412156621 is 12665121498481.

It is a cyclic number.

It is not a de Polignac number, because 18489412156621 - 2⁷ = 18489412156493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18489412156681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22030546 + ... + 22854403.

It is an arithmetic number, because the mean of its divisors is an integer number (1338469209000).

Almost surely, 2^{18489412156621} is an apocalyptic number.

It is an amenable number.

18489412156621 is a deficient number, since it is larger than the sum of its proper divisors (2926095187379).

18489412156621 is an equidigital number, since it uses as much as digits as its factorization.

18489412156621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44885748.

The product of its digits is 6635520, while the sum is 58.

The spelling of 18489412156621 in words is "eighteen trillion, four hundred eighty-nine billion, four hundred twelve million, one hundred fifty-six thousand, six hundred twenty-one".