669112789 has 2 divisors, whose sum is σ = 669112790. Its totient is φ = 669112788.

The previous prime is 669112783. The next prime is 669112793. The reversal of 669112789 is 987211966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667343889 + 1768900 = 25833^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 669112789 - 2³ = 669112781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669112781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334556394 + 334556395.

It is an arithmetic number, because the mean of its divisors is an integer number (334556395).

Almost surely, 2^669112789 is an apocalyptic number.

It is an amenable number.

669112789 is a deficient number, since it is larger than the sum of its proper divisors (1).

669112789 is an equidigital number, since it uses as much as digits as its factorization.

669112789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 669112789 is about 25867.2145582009. The cubic root of 669112789 is about 874.6476029656.

The spelling of 669112789 in words is "six hundred sixty-nine million, one hundred twelve thousand, seven hundred eighty-nine".