665797623 has 4 divisors (see below), whose sum is σ = 887730168. Its totient is φ = 443865080.

The previous prime is 665797609. The next prime is 665797651. The reversal of 665797623 is 326797566.

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 665797623 - 2²⁶ = 598688759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665797663) 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, 110966268 + ... + 110966273.

It is an arithmetic number, because the mean of its divisors is an integer number (221932542).

Almost surely, 2^665797623 is an apocalyptic number.

665797623 is a deficient number, since it is larger than the sum of its proper divisors (221932545).

665797623 is a wasteful number, since it uses less digits than its factorization.

665797623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221932544.

The product of its digits is 2857680, while the sum is 51.

The square root of 665797623 is about 25803.0545284856. The cubic root of 665797623 is about 873.2007098916.

The spelling of 665797623 in words is "six hundred sixty-five million, seven hundred ninety-seven thousand, six hundred twenty-three".