669637099 has 2 divisors, whose sum is σ = 669637100. Its totient is φ = 669637098.

The previous prime is 669637069. The next prime is 669637109. The reversal of 669637099 is 990736966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669637099 - 2⁹ = 669636587 is a prime.

It is not a weakly prime, because it can be changed into another prime (669637049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334818549 + 334818550.

It is an arithmetic number, because the mean of its divisors is an integer number (334818550).

Almost surely, 2^669637099 is an apocalyptic number.

669637099 is a deficient number, since it is larger than the sum of its proper divisors (1).

669637099 is an equidigital number, since it uses as much as digits as its factorization.

669637099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 55.

The square root of 669637099 is about 25877.3472172091. The cubic root of 669637099 is about 874.8759983189.

The spelling of 669637099 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, ninety-nine".