18861290947589 has 2 divisors, whose sum is σ = 18861290947590. Its totient is φ = 18861290947588.

The previous prime is 18861290947547. The next prime is 18861290947591. The reversal of 18861290947589 is 98574909216881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18846147676225 + 15143271364 = 4341215^2 + 123058^2 .

It is a cyclic number.

It is not a de Polignac number, because 18861290947589 - 2⁴⁰ = 17761779319813 is a prime.

Together with 18861290947591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18861290947489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430645473794 + 9430645473795.

It is an arithmetic number, because the mean of its divisors is an integer number (9430645473795).

Almost surely, 2^{18861290947589} is an apocalyptic number.

It is an amenable number.

18861290947589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18861290947589 is an equidigital number, since it uses as much as digits as its factorization.

18861290947589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 627056640, while the sum is 77.

The spelling of 18861290947589 in words is "eighteen trillion, eight hundred sixty-one billion, two hundred ninety million, nine hundred forty-seven thousand, five hundred eighty-nine".