665432965 has 4 divisors (see below), whose sum is σ = 798519564. Its totient is φ = 532346368.

The previous prime is 665432959. The next prime is 665432969. The reversal of 665432965 is 569234566.

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 315630756 + 349802209 = 17766^2 + 18703^2 .

It is a cyclic number.

It is not a de Polignac number, because 665432965 - 2⁷ = 665432837 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 (665432969) 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, 66543292 + ... + 66543301.

It is an arithmetic number, because the mean of its divisors is an integer number (199629891).

Almost surely, 2^665432965 is an apocalyptic number.

It is an amenable number.

665432965 is a deficient number, since it is larger than the sum of its proper divisors (133086599).

665432965 is a wasteful number, since it uses less digits than its factorization.

665432965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133086598.

The product of its digits is 1166400, while the sum is 46.

The square root of 665432965 is about 25795.9873817615. The cubic root of 665432965 is about 873.0412631548.

The spelling of 665432965 in words is "six hundred sixty-five million, four hundred thirty-two thousand, nine hundred sixty-five".