998667685993 has 2 divisors, whose sum is σ = 998667685994. Its totient is φ = 998667685992.

The previous prime is 998667685957. The next prime is 998667686077. The reversal of 998667685993 is 399586766899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807145918569 + 191521767424 = 898413^2 + 437632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998667685993 is a prime.

It is a super-2 number, since 2×998667685993² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998667685993.

It is not a weakly prime, because it can be changed into another prime (998667685903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499333842996 + 499333842997.

It is an arithmetic number, because the mean of its divisors is an integer number (499333842997).

Almost surely, 2^998667685993 is an apocalyptic number.

It is an amenable number.

998667685993 is a deficient number, since it is larger than the sum of its proper divisors (1).

998667685993 is an equidigital number, since it uses as much as digits as its factorization.

998667685993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9523422720, while the sum is 85.

The spelling of 998667685993 in words is "nine hundred ninety-eight billion, six hundred sixty-seven million, six hundred eighty-five thousand, nine hundred ninety-three".