669405601 has 2 divisors, whose sum is σ = 669405602. Its totient is φ = 669405600.

The previous prime is 669405557. The next prime is 669405613. The reversal of 669405601 is 106504966.

669405601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625050001 + 44355600 = 25001^2 + 6660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669405601 is a prime.

It is not a weakly prime, because it can be changed into another prime (669405641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334702800 + 334702801.

It is an arithmetic number, because the mean of its divisors is an integer number (334702801).

Almost surely, 2^669405601 is an apocalyptic number.

It is an amenable number.

669405601 is a deficient number, since it is larger than the sum of its proper divisors (1).

669405601 is an equidigital number, since it uses as much as digits as its factorization.

669405601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 669405601 is about 25872.8738450138. The cubic root of 669405601 is about 874.7751698814.

The spelling of 669405601 in words is "six hundred sixty-nine million, four hundred five thousand, six hundred one".