669006889 has 2 divisors, whose sum is σ = 669006890. Its totient is φ = 669006888.

The previous prime is 669006817. The next prime is 669006941. The reversal of 669006889 is 988600966.

It is an a-pointer prime, because the next prime (669006941) can be obtained adding 669006889 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668739600 + 267289 = 25860^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 669006889 - 2⁷ = 669006761 is a prime.

It is not a weakly prime, because it can be changed into another prime (669000889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334503444 + 334503445.

It is an arithmetic number, because the mean of its divisors is an integer number (334503445).

Almost surely, 2^669006889 is an apocalyptic number.

It is an amenable number.

669006889 is a deficient number, since it is larger than the sum of its proper divisors (1).

669006889 is an equidigital number, since it uses as much as digits as its factorization.

669006889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 669006889 is about 25865.1674844761. The cubic root of 669006889 is about 874.6014572486.

The spelling of 669006889 in words is "six hundred sixty-nine million, six thousand, eight hundred eighty-nine".