18912988966559 has 2 divisors, whose sum is σ = 18912988966560. Its totient is φ = 18912988966558.

The previous prime is 18912988966523. The next prime is 18912988966561. The reversal of 18912988966559 is 95566988921981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18912988966559 - 2²⁴ = 18912972189343 is a prime.

Together with 18912988966561, 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 (18912988966159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456494483279 + 9456494483280.

It is an arithmetic number, because the mean of its divisors is an integer number (9456494483280).

Almost surely, 2^{18912988966559} is an apocalyptic number.

18912988966559 is a deficient number, since it is larger than the sum of its proper divisors (1).

18912988966559 is an equidigital number, since it uses as much as digits as its factorization.

18912988966559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6046617600, while the sum is 86.

The spelling of 18912988966559 in words is "eighteen trillion, nine hundred twelve billion, nine hundred eighty-eight million, nine hundred sixty-six thousand, five hundred fifty-nine".