669433789 has 4 divisors (see below), whose sum is σ = 671330556. Its totient is φ = 667537024.

The previous prime is 669433733. The next prime is 669433823. The reversal of 669433789 is 987334966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99800100 + 569633689 = 9990^2 + 23867^2 .

It is a cyclic number.

It is not a de Polignac number, because 669433789 - 2¹⁷ = 669302717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669433729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947854 + ... + 948559.

It is an arithmetic number, because the mean of its divisors is an integer number (167832639).

Almost surely, 2^669433789 is an apocalyptic number.

It is an amenable number.

669433789 is a deficient number, since it is larger than the sum of its proper divisors (1896767).

669433789 is a wasteful number, since it uses less digits than its factorization.

669433789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896766.

The product of its digits is 5878656, while the sum is 55.

The square root of 669433789 is about 25873.4185796929. The cubic root of 669433789 is about 874.7874483447.

The spelling of 669433789 in words is "six hundred sixty-nine million, four hundred thirty-three thousand, seven hundred eighty-nine".