999868004357 has 2 divisors, whose sum is σ = 999868004358. Its totient is φ = 999868004356.

The previous prime is 999868004329. The next prime is 999868004389. The reversal of 999868004357 is 753400868999.

It is a Cunningham number, because it is equal to 999934²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999868004356 + 1 = 999934^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999868004357 - 2²² = 999863810053 is a prime.

It is a super-2 number, since 2×999868004357² (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 (999868004657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499934002178 + 499934002179.

It is an arithmetic number, because the mean of its divisors is an integer number (499934002179).

Almost surely, 2^999868004357 is an apocalyptic number.

It is an amenable number.

999868004357 is a deficient number, since it is larger than the sum of its proper divisors (1).

999868004357 is an equidigital number, since it uses as much as digits as its factorization.

999868004357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117573120, while the sum is 68.

The spelling of 999868004357 in words is "nine hundred ninety-nine billion, eight hundred sixty-eight million, four thousand, three hundred fifty-seven".