668807147 has 2 divisors, whose sum is σ = 668807148. Its totient is φ = 668807146.

The previous prime is 668807141. The next prime is 668807173. The reversal of 668807147 is 741708866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668807147 - 2²⁶ = 601698283 is a prime.

It is not a weakly prime, because it can be changed into another prime (668807141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334403573 + 334403574.

It is an arithmetic number, because the mean of its divisors is an integer number (334403574).

Almost surely, 2^668807147 is an apocalyptic number.

668807147 is a deficient number, since it is larger than the sum of its proper divisors (1).

668807147 is an equidigital number, since it uses as much as digits as its factorization.

668807147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 668807147 is about 25861.3059801705. The cubic root of 668807147 is about 874.5144068082.

The spelling of 668807147 in words is "six hundred sixty-eight million, eight hundred seven thousand, one hundred forty-seven".