669695423 has 2 divisors, whose sum is σ = 669695424. Its totient is φ = 669695422.

The previous prime is 669695417. The next prime is 669695461. The reversal of 669695423 is 324596966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669695423 - 2⁴ = 669695407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669695723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334847711 + 334847712.

It is an arithmetic number, because the mean of its divisors is an integer number (334847712).

Almost surely, 2^669695423 is an apocalyptic number.

669695423 is a deficient number, since it is larger than the sum of its proper divisors (1).

669695423 is an equidigital number, since it uses as much as digits as its factorization.

669695423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 50.

The square root of 669695423 is about 25878.4741242601. The cubic root of 669695423 is about 874.9013975421.

The spelling of 669695423 in words is "six hundred sixty-nine million, six hundred ninety-five thousand, four hundred twenty-three".