999868004657 has 2 divisors, whose sum is σ = 999868004658. Its totient is φ = 999868004656.

The previous prime is 999868004621. The next prime is 999868004731. The reversal of 999868004657 is 756400868999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549390781681 + 450477222976 = 741209^2 + 671176^2 .

It is a cyclic number.

It is not a de Polignac number, because 999868004657 - 2⁶ = 999868004593 is a prime.

It is not a weakly prime, because it can be changed into another prime (999868004357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499934002328 + 499934002329.

It is an arithmetic number, because the mean of its divisors is an integer number (499934002329).

Almost surely, 2^999868004657 is an apocalyptic number.

It is an amenable number.

999868004657 is a deficient number, since it is larger than the sum of its proper divisors (1).

999868004657 is an equidigital number, since it uses as much as digits as its factorization.

999868004657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235146240, while the sum is 71.

The spelling of 999868004657 in words is "nine hundred ninety-nine billion, eight hundred sixty-eight million, four thousand, six hundred fifty-seven".