669947983 has 2 divisors, whose sum is σ = 669947984. Its totient is φ = 669947982.

The previous prime is 669947921. The next prime is 669948001. The reversal of 669947983 is 389749966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669947983 - 2²⁵ = 636393551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669947683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334973991 + 334973992.

It is an arithmetic number, because the mean of its divisors is an integer number (334973992).

Almost surely, 2^669947983 is an apocalyptic number.

669947983 is a deficient number, since it is larger than the sum of its proper divisors (1).

669947983 is an equidigital number, since it uses as much as digits as its factorization.

669947983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 61.

The square root of 669947983 is about 25883.3533955707. The cubic root of 669947983 is about 875.0113666006.

The spelling of 669947983 in words is "six hundred sixty-nine million, nine hundred forty-seven thousand, nine hundred eighty-three".