18542487589 has 2 divisors, whose sum is σ = 18542487590. Its totient is φ = 18542487588.

The previous prime is 18542487559. The next prime is 18542487631. The reversal of 18542487589 is 98578424581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12203620900 + 6338866689 = 110470^2 + 79617^2 .

It is a cyclic number.

It is not a de Polignac number, because 18542487589 - 2¹¹ = 18542485541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18542487539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9271243794 + 9271243795.

It is an arithmetic number, because the mean of its divisors is an integer number (9271243795).

Almost surely, 2^18542487589 is an apocalyptic number.

It is an amenable number.

18542487589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18542487589 is an equidigital number, since it uses as much as digits as its factorization.

18542487589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25804800, while the sum is 61.

The spelling of 18542487589 in words is "eighteen billion, five hundred forty-two million, four hundred eighty-seven thousand, five hundred eighty-nine".