666432889 has 4 divisors (see below), whose sum is σ = 695408256. Its totient is φ = 637457524.

The previous prime is 666432887. The next prime is 666432911. The reversal of 666432889 is 988234666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666432889 - 2¹ = 666432887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666432887) 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 in 3 ways as a sum of consecutive naturals, for example, 14487649 + ... + 14487694.

It is an arithmetic number, because the mean of its divisors is an integer number (173852064).

Almost surely, 2^666432889 is an apocalyptic number.

It is an amenable number.

666432889 is a deficient number, since it is larger than the sum of its proper divisors (28975367).

666432889 is a wasteful number, since it uses less digits than its factorization.

666432889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28975366.

The product of its digits is 2985984, while the sum is 52.

The square root of 666432889 is about 25815.3614927237. The cubic root of 666432889 is about 873.4783409969.

The spelling of 666432889 in words is "six hundred sixty-six million, four hundred thirty-two thousand, eight hundred eighty-nine".