18158080189021 has 2 divisors, whose sum is σ = 18158080189022. Its totient is φ = 18158080189020.

The previous prime is 18158080189013. The next prime is 18158080189031. The reversal of 18158080189021 is 12098108085181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15413554520100 + 2744525668921 = 3926010^2 + 1656661^2 .

It is a cyclic number.

It is not a de Polignac number, because 18158080189021 - 2³ = 18158080189013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18158080189021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18158080189031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079040094510 + 9079040094511.

It is an arithmetic number, because the mean of its divisors is an integer number (9079040094511).

Almost surely, 2^{18158080189021} is an apocalyptic number.

It is an amenable number.

18158080189021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18158080189021 is an equidigital number, since it uses as much as digits as its factorization.

18158080189021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 52.

The spelling of 18158080189021 in words is "eighteen trillion, one hundred fifty-eight billion, eighty million, one hundred eighty-nine thousand, twenty-one".