667808623 has 4 divisors (see below), whose sum is σ = 668418480. Its totient is φ = 667198768.

The previous prime is 667808593. The next prime is 667808627. The reversal of 667808623 is 326808766.

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 667808623 - 2⁵ = 667808591 is a prime.

It is a super-2 number, since 2×667808623² = 891936713906312258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667808627) 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, 303283 + ... + 305476.

It is an arithmetic number, because the mean of its divisors is an integer number (167104620).

Almost surely, 2^667808623 is an apocalyptic number.

667808623 is a deficient number, since it is larger than the sum of its proper divisors (609857).

667808623 is a wasteful number, since it uses less digits than its factorization.

667808623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609856.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 667808623 is about 25841.9934022126. The cubic root of 667808623 is about 874.0789755779.

The spelling of 667808623 in words is "six hundred sixty-seven million, eight hundred eight thousand, six hundred twenty-three".