998865062373817 has 4 divisors (see below), whose sum is σ = 998865126886900. Its totient is φ = 998864997860736.

The previous prime is 998865062373799. The next prime is 998865062373863. The reversal of 998865062373817 is 718373260568899.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 574058790306576 + 424806272067241 = 23959524^2 + 20610829^2 .

It is a 3-Lehmer number, since φ(998865062373817) divides (998865062373817-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998865062373817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998865066373817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6451309 + ... + 45159157.

It is an arithmetic number, because the mean of its divisors is an integer number (249716281721725).

It is a Poulet number, since it divides 2^{998865062373816}-1.

Almost surely, 2^{998865062373817} is an apocalyptic number.

998865062373817 is the 25805233-rd pentagonal number.

It is an amenable number.

998865062373817 is a deficient number, since it is larger than the sum of its proper divisors (64513083).

998865062373817 is a wasteful number, since it uses less digits than its factorization.

998865062373817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64513082.

The product of its (nonzero) digits is 6584094720, while the sum is 82.

The spelling of 998865062373817 in words is "nine hundred ninety-eight trillion, eight hundred sixty-five billion, sixty-two million, three hundred seventy-three thousand, eight hundred seventeen".