669675431 has 2 divisors, whose sum is σ = 669675432. Its totient is φ = 669675430.

The previous prime is 669675389. The next prime is 669675449. The reversal of 669675431 is 134576966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669675431 - 2¹⁰ = 669674407 is a prime.

It is a super-2 number, since 2×669675431² = 896930365770071522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669675481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334837715 + 334837716.

It is an arithmetic number, because the mean of its divisors is an integer number (334837716).

Almost surely, 2^669675431 is an apocalyptic number.

669675431 is a deficient number, since it is larger than the sum of its proper divisors (1).

669675431 is an equidigital number, since it uses as much as digits as its factorization.

669675431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 669675431 is about 25878.0878543991. The cubic root of 669675431 is about 874.8926914935.

The spelling of 669675431 in words is "six hundred sixty-nine million, six hundred seventy-five thousand, four hundred thirty-one".