665095989 has 8 divisors (see below), whose sum is σ = 886961152. Its totient is φ = 443314080.

The previous prime is 665095933. The next prime is 665095997. The reversal of 665095989 is 989590566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665095989 - 2⁸ = 665095733 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 (665095999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137 + ... + 36489.

It is an arithmetic number, because the mean of its divisors is an integer number (110870144).

Almost surely, 2^665095989 is an apocalyptic number.

It is an amenable number.

665095989 is a deficient number, since it is larger than the sum of its proper divisors (221865163).

665095989 is a wasteful number, since it uses less digits than its factorization.

665095989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41627.

The product of its (nonzero) digits is 5248800, while the sum is 57.

The square root of 665095989 is about 25789.4549961801. The cubic root of 665095989 is about 872.8938685800.

The spelling of 665095989 in words is "six hundred sixty-five million, ninety-five thousand, nine hundred eighty-nine".