669771629 has 2 divisors, whose sum is σ = 669771630. Its totient is φ = 669771628.

The previous prime is 669771589. The next prime is 669771631. The reversal of 669771629 is 926177966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455822500 + 213949129 = 21350^2 + 14627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669771629 is a prime.

Together with 669771631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669771929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334885814 + 334885815.

It is an arithmetic number, because the mean of its divisors is an integer number (334885815).

Almost surely, 2^669771629 is an apocalyptic number.

It is an amenable number.

669771629 is a deficient number, since it is larger than the sum of its proper divisors (1).

669771629 is an equidigital number, since it uses as much as digits as its factorization.

669771629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 53.

The square root of 669771629 is about 25879.9464643959. The cubic root of 669771629 is about 874.9345818847.

The spelling of 669771629 in words is "six hundred sixty-nine million, seven hundred seventy-one thousand, six hundred twenty-nine".