669798907 has 2 divisors, whose sum is σ = 669798908. Its totient is φ = 669798906.

The previous prime is 669798881. The next prime is 669798949. The reversal of 669798907 is 709897966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669798907 is a prime.

It is not a weakly prime, because it can be changed into another prime (669798967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334899453 + 334899454.

It is an arithmetic number, because the mean of its divisors is an integer number (334899454).

Almost surely, 2^669798907 is an apocalyptic number.

669798907 is a deficient number, since it is larger than the sum of its proper divisors (1).

669798907 is an equidigital number, since it uses as much as digits as its factorization.

669798907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The square root of 669798907 is about 25880.4734693939. The cubic root of 669798907 is about 874.9464596356.

The spelling of 669798907 in words is "six hundred sixty-nine million, seven hundred ninety-eight thousand, nine hundred seven".