665874623 has 4 divisors (see below), whose sum is σ = 668732688. Its totient is φ = 663016560.

The previous prime is 665874619. The next prime is 665874631. The reversal of 665874623 is 326478566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665874623 - 2² = 665874619 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 (665874653) 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, 1428683 + ... + 1429148.

It is an arithmetic number, because the mean of its divisors is an integer number (167183172).

Almost surely, 2^665874623 is an apocalyptic number.

665874623 is a deficient number, since it is larger than the sum of its proper divisors (2858065).

665874623 is a wasteful number, since it uses less digits than its factorization.

665874623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858064.

The product of its digits is 1451520, while the sum is 47.

The square root of 665874623 is about 25804.5465567601. The cubic root of 665874623 is about 873.2343707021.

The spelling of 665874623 in words is "six hundred sixty-five million, eight hundred seventy-four thousand, six hundred twenty-three".