669670889 has 2 divisors, whose sum is σ = 669670890. Its totient is φ = 669670888.

The previous prime is 669670879. The next prime is 669670907. The reversal of 669670889 is 988076966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335512489 + 334158400 = 18317^2 + 18280^2 .

It is a cyclic number.

It is not a de Polignac number, because 669670889 - 2⁸ = 669670633 is a prime.

It is not a weakly prime, because it can be changed into another prime (669670819) 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, 334835444 + 334835445.

It is an arithmetic number, because the mean of its divisors is an integer number (334835445).

Almost surely, 2^669670889 is an apocalyptic number.

It is an amenable number.

669670889 is a deficient number, since it is larger than the sum of its proper divisors (1).

669670889 is an equidigital number, since it uses as much as digits as its factorization.

669670889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The square root of 669670889 is about 25878.0000966072. Note that the first 4 decimals coincide. The cubic root of 669670889 is about 874.8907135345.

The spelling of 669670889 in words is "six hundred sixty-nine million, six hundred seventy thousand, eight hundred eighty-nine".