666165597 has 4 divisors (see below), whose sum is σ = 888220800. Its totient is φ = 444110396.

The previous prime is 666165571. The next prime is 666165607. The reversal of 666165597 is 795561666.

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 a cyclic number.

It is not a de Polignac number, because 666165597 - 2¹² = 666161501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666165527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111027597 + ... + 111027602.

It is an arithmetic number, because the mean of its divisors is an integer number (222055200).

Almost surely, 2^666165597 is an apocalyptic number.

It is an amenable number.

666165597 is a deficient number, since it is larger than the sum of its proper divisors (222055203).

666165597 is a wasteful number, since it uses less digits than its factorization.

666165597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222055202.

The product of its digits is 2041200, while the sum is 51.

The square root of 666165597 is about 25810.1839784222. The cubic root of 666165597 is about 873.3615475446.

The spelling of 666165597 in words is "six hundred sixty-six million, one hundred sixty-five thousand, five hundred ninety-seven".