668499669 has 32 divisors (see below), whose sum is σ = 1048919040. Its totient is φ = 419900976.

The previous prime is 668499647. The next prime is 668499691. The reversal of 668499669 is 966994866.

It is an interprime number because it is at equal distance from previous prime (668499647) and next prime (668499691).

It is not a de Polignac number, because 668499669 - 2⁸ = 668499413 is a prime.

It is a super-2 number, since 2×668499669² = 893783614906219122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668499269) 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 31 ways as a sum of consecutive naturals, for example, 33574 + ... + 49640.

It is an arithmetic number, because the mean of its divisors is an integer number (32778720).

Almost surely, 2^668499669 is an apocalyptic number.

668499669 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

668499669 is a deficient number, since it is larger than the sum of its proper divisors (380419371).

668499669 is a wasteful number, since it uses less digits than its factorization.

668499669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16166 (or 16160 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 63.

The square root of 668499669 is about 25855.3605467029. The cubic root of 668499669 is about 874.3803695850.

The spelling of 668499669 in words is "six hundred sixty-eight million, four hundred ninety-nine thousand, six hundred sixty-nine".