668651107 has 2 divisors, whose sum is σ = 668651108. Its totient is φ = 668651106.

The previous prime is 668651077. The next prime is 668651141. The reversal of 668651107 is 701156866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668651107 - 2⁷ = 668650979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668651107.

It is not a weakly prime, because it can be changed into another prime (668651197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334325553 + 334325554.

It is an arithmetic number, because the mean of its divisors is an integer number (334325554).

Almost surely, 2^668651107 is an apocalyptic number.

668651107 is a deficient number, since it is larger than the sum of its proper divisors (1).

668651107 is an equidigital number, since it uses as much as digits as its factorization.

668651107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 668651107 is about 25858.2889418461. The cubic root of 668651107 is about 874.4463902693.

The spelling of 668651107 in words is "six hundred sixty-eight million, six hundred fifty-one thousand, one hundred seven".