668966403 has 32 divisors (see below), whose sum is σ = 1056706560. Its totient is φ = 368323200.

The previous prime is 668966377. The next prime is 668966413. The reversal of 668966403 is 304669866.

It is not a de Polignac number, because 668966403 - 2²⁰ = 667917827 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (668966413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426126 + ... + 427692.

It is an arithmetic number, because the mean of its divisors is an integer number (33022080).

Almost surely, 2^668966403 is an apocalyptic number.

668966403 is a deficient number, since it is larger than the sum of its proper divisors (387740157).

668966403 is a wasteful number, since it uses less digits than its factorization.

668966403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The square root of 668966403 is about 25864.3848370689. The cubic root of 668966403 is about 874.5838142669.

The spelling of 668966403 in words is "six hundred sixty-eight million, nine hundred sixty-six thousand, four hundred three".