665675689 has 4 divisors (see below), whose sum is σ = 760772224. Its totient is φ = 570579156.

The previous prime is 665675677. The next prime is 665675723. The reversal of 665675689 is 986576566.

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 not a de Polignac number, because 665675689 - 2¹⁷ = 665544617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665675609) 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, 47548257 + ... + 47548270.

It is an arithmetic number, because the mean of its divisors is an integer number (190193056).

Almost surely, 2^665675689 is an apocalyptic number.

It is an amenable number.

665675689 is a deficient number, since it is larger than the sum of its proper divisors (95096535).

665675689 is an equidigital number, since it uses as much as digits as its factorization.

665675689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95096534.

The product of its digits is 16329600, while the sum is 58.

The square root of 665675689 is about 25800.6916380162. The cubic root of 665675689 is about 873.1474007217.

The spelling of 665675689 in words is "six hundred sixty-five million, six hundred seventy-five thousand, six hundred eighty-nine".