668043951 has 16 divisors (see below), whose sum is σ = 956045664. Its totient is φ = 413420544.

The previous prime is 668043923. The next prime is 668043953. The reversal of 668043951 is 159340866.

It is not a de Polignac number, because 668043951 - 2⁷ = 668043823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668043953) 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 15 ways as a sum of consecutive naturals, for example, 85996 + ... + 93441.

It is an arithmetic number, because the mean of its divisors is an integer number (59752854).

Almost surely, 2^668043951 is an apocalyptic number.

668043951 is a deficient number, since it is larger than the sum of its proper divisors (288001713).

668043951 is a wasteful number, since it uses less digits than its factorization.

668043951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179530.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 668043951 is about 25846.5462102773. The cubic root of 668043951 is about 874.1816352788.

The spelling of 668043951 in words is "six hundred sixty-eight million, forty-three thousand, nine hundred fifty-one".