18942403189 has 2 divisors, whose sum is σ = 18942403190. Its totient is φ = 18942403188.

The previous prime is 18942403147. The next prime is 18942403201. The reversal of 18942403189 is 98130424981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10765722564 + 8176680625 = 103758^2 + 90425^2 .

It is a cyclic number.

It is not a de Polignac number, because 18942403189 - 2²³ = 18934014581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18942403589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471201594 + 9471201595.

It is an arithmetic number, because the mean of its divisors is an integer number (9471201595).

Almost surely, 2^18942403189 is an apocalyptic number.

It is an amenable number.

18942403189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942403189 is an equidigital number, since it uses as much as digits as its factorization.

18942403189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 18942403189 in words is "eighteen billion, nine hundred forty-two million, four hundred three thousand, one hundred eighty-nine".