668496951 has 12 divisors (see below), whose sum is σ = 998903880. Its totient is φ = 430296720.

The previous prime is 668496901. The next prime is 668496971. The reversal of 668496951 is 159694866.

It is a happy number.

668496951 is a `hidden beast` number, since 6 + 68 + 496 + 95 + 1 = 666.

It is not a de Polignac number, because 668496951 - 2⁷ = 668496823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668496901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1280385 + ... + 1280906.

It is an arithmetic number, because the mean of its divisors is an integer number (83241990).

Almost surely, 2^668496951 is an apocalyptic number.

668496951 is a deficient number, since it is larger than the sum of its proper divisors (330406929).

668496951 is a wasteful number, since it uses less digits than its factorization.

668496951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561326 (or 2561323 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 668496951 is about 25855.3079850154. The cubic root of 668496951 is about 874.3791845587.

The spelling of 668496951 in words is "six hundred sixty-eight million, four hundred ninety-six thousand, nine hundred fifty-one".