669766577 has 2 divisors, whose sum is σ = 669766578. Its totient is φ = 669766576.

The previous prime is 669766567. The next prime is 669766579. The reversal of 669766577 is 775667966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611869696 + 57896881 = 24736^2 + 7609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669766577 is a prime.

Together with 669766579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669766579) 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, 334883288 + 334883289.

It is an arithmetic number, because the mean of its divisors is an integer number (334883289).

Almost surely, 2^669766577 is an apocalyptic number.

It is an amenable number.

669766577 is a deficient number, since it is larger than the sum of its proper divisors (1).

669766577 is an equidigital number, since it uses as much as digits as its factorization.

669766577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20003760, while the sum is 59.

The square root of 669766577 is about 25879.8488596823. The cubic root of 669766577 is about 874.9323820401.

The spelling of 669766577 in words is "six hundred sixty-nine million, seven hundred sixty-six thousand, five hundred seventy-seven".