999625663 has 4 divisors (see below), whose sum is σ = 1052237560. Its totient is φ = 947013768.

The previous prime is 999625603. The next prime is 999625667. The reversal of 999625663 is 366526999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366526999 = 617 ⋅594047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999625663 is a prime.

It is a super-2 number, since 2×999625663² = 1998502932256379138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999625667) 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 in 3 ways as a sum of consecutive naturals, for example, 26305920 + ... + 26305957.

It is an arithmetic number, because the mean of its divisors is an integer number (263059390).

Almost surely, 2^999625663 is an apocalyptic number.

999625663 is a deficient number, since it is larger than the sum of its proper divisors (52611897).

999625663 is a wasteful number, since it uses less digits than its factorization.

999625663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52611896.

The product of its digits is 4723920, while the sum is 55.

The square root of 999625663 is about 31616.8572600124. The cubic root of 999625663 is about 999.8752054270.

It can be divided in two parts, 99962 and 5663, that added together give a square (105625 = 325²).

The spelling of 999625663 in words is "nine hundred ninety-nine million, six hundred twenty-five thousand, six hundred sixty-three".