669807967 has 2 divisors, whose sum is σ = 669807968. Its totient is φ = 669807966.

The previous prime is 669807949. The next prime is 669807977. The reversal of 669807967 is 769708966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669807967 - 2¹⁹ = 669283679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669807937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334903983 + 334903984.

It is an arithmetic number, because the mean of its divisors is an integer number (334903984).

Almost surely, 2^669807967 is an apocalyptic number.

669807967 is a deficient number, since it is larger than the sum of its proper divisors (1).

669807967 is an equidigital number, since it uses as much as digits as its factorization.

669807967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The square root of 669807967 is about 25880.6485042396. The cubic root of 669807967 is about 874.9504045903.

Subtracting 669807967 from its reverse (769708966), we obtain a palindrome (99900999).

It can be divided in two parts, 66980 and 7967, that added together give a palindrome (74947).

The spelling of 669807967 in words is "six hundred sixty-nine million, eight hundred seven thousand, nine hundred sixty-seven".