665072433 has 6 divisors (see below), whose sum is σ = 960660194. Its totient is φ = 443381616.

The previous prime is 665072431. The next prime is 665072477. The reversal of 665072433 is 334270566.

It can be written as a sum of positive squares in only one way, i.e., 334450944 + 330621489 = 18288^2 + 18183^2 .

It is not a de Polignac number, because 665072433 - 2¹ = 665072431 is a prime.

It is a super-2 number, since 2×665072433² = 884642682273078978, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665072431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36948460 + ... + 36948477.

Almost surely, 2^665072433 is an apocalyptic number.

It is an amenable number.

665072433 is a deficient number, since it is larger than the sum of its proper divisors (295587761).

665072433 is a wasteful number, since it uses less digits than its factorization.

665072433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73896943 (or 73896940 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The square root of 665072433 is about 25788.9982938462. The cubic root of 665072433 is about 872.8835632351.

The spelling of 665072433 in words is "six hundred sixty-five million, seventy-two thousand, four hundred thirty-three".