18546481589 has 2 divisors, whose sum is σ = 18546481590. Its totient is φ = 18546481588.

The previous prime is 18546481529. The next prime is 18546481627. The reversal of 18546481589 is 98518464581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14252300689 + 4294180900 = 119383^2 + 65530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18546481589 is a prime.

It is a super-2 number, since 2×18546481589² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18546481529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9273240794 + 9273240795.

It is an arithmetic number, because the mean of its divisors is an integer number (9273240795).

Almost surely, 2^18546481589 is an apocalyptic number.

It is an amenable number.

18546481589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18546481589 is an equidigital number, since it uses as much as digits as its factorization.

18546481589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11059200, while the sum is 59.

The spelling of 18546481589 in words is "eighteen billion, five hundred forty-six million, four hundred eighty-one thousand, five hundred eighty-nine".