668556103 has 2 divisors, whose sum is σ = 668556104. Its totient is φ = 668556102.

The previous prime is 668556079. The next prime is 668556113. The reversal of 668556103 is 301655866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668556103 - 2¹³ = 668547911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668556113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334278051 + 334278052.

It is an arithmetic number, because the mean of its divisors is an integer number (334278052).

Almost surely, 2^668556103 is an apocalyptic number.

668556103 is a deficient number, since it is larger than the sum of its proper divisors (1).

668556103 is an equidigital number, since it uses as much as digits as its factorization.

668556103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 668556103 is about 25856.4518640899. The cubic root of 668556103 is about 874.4049736327.

The spelling of 668556103 in words is "six hundred sixty-eight million, five hundred fifty-six thousand, one hundred three".