668720603 has 2 divisors, whose sum is σ = 668720604. Its totient is φ = 668720602.

The previous prime is 668720587. The next prime is 668720621. The reversal of 668720603 is 306027866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668720603 - 2⁴ = 668720587 is a prime.

It is a Sophie Germain prime.

It is equal to p_34715486 and since 668720603 and 34715486 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (668720683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334360301 + 334360302.

It is an arithmetic number, because the mean of its divisors is an integer number (334360302).

Almost surely, 2^668720603 is an apocalyptic number.

668720603 is a deficient number, since it is larger than the sum of its proper divisors (1).

668720603 is an equidigital number, since it uses as much as digits as its factorization.

668720603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 668720603 is about 25859.6326926737. The cubic root of 668720603 is about 874.4766843048.

The spelling of 668720603 in words is "six hundred sixty-eight million, seven hundred twenty thousand, six hundred three".