998650359181 has 2 divisors, whose sum is σ = 998650359182. Its totient is φ = 998650359180.

The previous prime is 998650359169. The next prime is 998650359197. The reversal of 998650359181 is 181953056899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997819190281 + 831168900 = 998909^2 + 28830^2 .

It is a cyclic number.

It is not a de Polignac number, because 998650359181 - 2⁷ = 998650359053 is a prime.

It is a super-2 number, since 2×998650359181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998650359101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499325179590 + 499325179591.

It is an arithmetic number, because the mean of its divisors is an integer number (499325179591).

Almost surely, 2^998650359181 is an apocalyptic number.

It is an amenable number.

998650359181 is a deficient number, since it is larger than the sum of its proper divisors (1).

998650359181 is an equidigital number, since it uses as much as digits as its factorization.

998650359181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20995200, while the sum is 64.

The spelling of 998650359181 in words is "nine hundred ninety-eight billion, six hundred fifty million, three hundred fifty-nine thousand, one hundred eighty-one".