999960667 has 2 divisors, whose sum is σ = 999960668. Its totient is φ = 999960666.

The previous prime is 999960613. The next prime is 999960683. The reversal of 999960667 is 766069999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999960667 - 2²³ = 991572059 is a prime.

It is not a weakly prime, because it can be changed into another prime (999960697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980333 + 499980334.

It is an arithmetic number, because the mean of its divisors is an integer number (499980334).

Almost surely, 2^999960667 is an apocalyptic number.

999960667 is a deficient number, since it is larger than the sum of its proper divisors (1).

999960667 is an equidigital number, since it uses as much as digits as its factorization.

999960667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9920232, while the sum is 61.

The square root of 999960667 is about 31622.1546862322. The cubic root of 999960667 is about 999.9868888281.

The spelling of 999960667 in words is "nine hundred ninety-nine million, nine hundred sixty thousand, six hundred sixty-seven".