669658051 has 2 divisors, whose sum is σ = 669658052. Its totient is φ = 669658050.

The previous prime is 669658037. The next prime is 669658057. The reversal of 669658051 is 150856966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669658051 - 2⁹ = 669657539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669657992 and 669658010.

It is not a weakly prime, because it can be changed into another prime (669658057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334829025 + 334829026.

It is an arithmetic number, because the mean of its divisors is an integer number (334829026).

Almost surely, 2^669658051 is an apocalyptic number.

669658051 is a deficient number, since it is larger than the sum of its proper divisors (1).

669658051 is an equidigital number, since it uses as much as digits as its factorization.

669658051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 669658051 is about 25877.7520468838. The cubic root of 669658051 is about 874.8851227690.

The spelling of 669658051 in words is "six hundred sixty-nine million, six hundred fifty-eight thousand, fifty-one".