998960948857 has 2 divisors, whose sum is σ = 998960948858. Its totient is φ = 998960948856.

The previous prime is 998960948837. The next prime is 998960948897. The reversal of 998960948857 is 758849069899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990231970816 + 8728978041 = 995104^2 + 93429^2 .

It is a cyclic number.

It is not a de Polignac number, because 998960948857 - 2⁷ = 998960948729 is a prime.

It is not a weakly prime, because it can be changed into another prime (998960948837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499480474428 + 499480474429.

It is an arithmetic number, because the mean of its divisors is an integer number (499480474429).

Almost surely, 2^998960948857 is an apocalyptic number.

It is an amenable number.

998960948857 is a deficient number, since it is larger than the sum of its proper divisors (1).

998960948857 is an equidigital number, since it uses as much as digits as its factorization.

998960948857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2821754880, while the sum is 82.

The spelling of 998960948857 in words is "nine hundred ninety-eight billion, nine hundred sixty million, nine hundred forty-eight thousand, eight hundred fifty-seven".