998617725659 has 2 divisors, whose sum is σ = 998617725660. Its totient is φ = 998617725658.

The previous prime is 998617725653. The next prime is 998617725683. The reversal of 998617725659 is 956527716899.

It is a weak prime.

It is an emirp because it is prime and its reverse (956527716899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998617725659 - 2²⁰ = 998616677083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (998617725653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499308862829 + 499308862830.

It is an arithmetic number, because the mean of its divisors is an integer number (499308862830).

Almost surely, 2^998617725659 is an apocalyptic number.

998617725659 is a deficient number, since it is larger than the sum of its proper divisors (1).

998617725659 is an equidigital number, since it uses as much as digits as its factorization.

998617725659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 514382400, while the sum is 74.

The spelling of 998617725659 in words is "nine hundred ninety-eight billion, six hundred seventeen million, seven hundred twenty-five thousand, six hundred fifty-nine".