665874890 has 8 divisors (see below), whose sum is σ = 1198574820. Its totient is φ = 266349952.

The previous prime is 665874857. The next prime is 665874907. The reversal of 665874890 is 98478566.

665874890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 610238209 + 55636681 = 24703^2 + 7459^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33293735 + ... + 33293754.

Almost surely, 2^665874890 is an apocalyptic number.

665874890 is a deficient number, since it is larger than the sum of its proper divisors (532699930).

665874890 is a wasteful number, since it uses less digits than its factorization.

665874890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66587496.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 665874890 is about 25804.5517302665. The cubic root of 665874890 is about 873.2344874175.

The spelling of 665874890 in words is "six hundred sixty-five million, eight hundred seventy-four thousand, eight hundred ninety".