669318451 has 2 divisors, whose sum is σ = 669318452. Its totient is φ = 669318450.

The previous prime is 669318439. The next prime is 669318467. The reversal of 669318451 is 154813966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669318451 - 2⁹ = 669317939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669318398 and 669318407.

It is not a weakly prime, because it can be changed into another prime (669318401) 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, 334659225 + 334659226.

It is an arithmetic number, because the mean of its divisors is an integer number (334659226).

Almost surely, 2^669318451 is an apocalyptic number.

669318451 is a deficient number, since it is larger than the sum of its proper divisors (1).

669318451 is an equidigital number, since it uses as much as digits as its factorization.

669318451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 669318451 is about 25871.1895938320. The cubic root of 669318451 is about 874.7372058704.

The spelling of 669318451 in words is "six hundred sixty-nine million, three hundred eighteen thousand, four hundred fifty-one".