999995663 has 2 divisors, whose sum is σ = 999995664. Its totient is φ = 999995662.

The previous prime is 999995651. The next prime is 999995677. The reversal of 999995663 is 366599999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999995663 - 2⁶ = 999995599 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999995663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997831 + 499997832.

It is an arithmetic number, because the mean of its divisors is an integer number (499997832).

Almost surely, 2^999995663 is an apocalyptic number.

999995663 is a deficient number, since it is larger than the sum of its proper divisors (1).

999995663 is an equidigital number, since it uses as much as digits as its factorization.

999995663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31886460, while the sum is 65.

The square root of 999995663 is about 31622.7080276184. The cubic root of 999995663 is about 999.9985543312.

The spelling of 999995663 in words is "nine hundred ninety-nine million, nine hundred ninety-five thousand, six hundred sixty-three".