999715663 has 2 divisors, whose sum is σ = 999715664. Its totient is φ = 999715662.

The previous prime is 999715589. The next prime is 999715687. The reversal of 999715663 is 366517999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999715663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999715693) 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, 499857831 + 499857832.

It is an arithmetic number, because the mean of its divisors is an integer number (499857832).

Almost surely, 2^999715663 is an apocalyptic number.

999715663 is a deficient number, since it is larger than the sum of its proper divisors (1).

999715663 is an equidigital number, since it uses as much as digits as its factorization.

999715663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 55.

The square root of 999715663 is about 31618.2805193451. The cubic root of 999715663 is about 999.9052120155.

The spelling of 999715663 in words is "nine hundred ninety-nine million, seven hundred fifteen thousand, six hundred sixty-three".