667816795 has 4 divisors (see below), whose sum is σ = 801380160. Its totient is φ = 534253432.

The previous prime is 667816781. The next prime is 667816817. The reversal of 667816795 is 597618766.

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 667816795 - 2⁹ = 667816283 is a prime.

It is an unprimeable number.

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, 66781675 + ... + 66781684.

It is an arithmetic number, because the mean of its divisors is an integer number (200345040).

Almost surely, 2^667816795 is an apocalyptic number.

667816795 is a deficient number, since it is larger than the sum of its proper divisors (133563365).

667816795 is a wasteful number, since it uses less digits than its factorization.

667816795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133563364.

The product of its digits is 3810240, while the sum is 55.

The square root of 667816795 is about 25842.1515164663. The cubic root of 667816795 is about 874.0825409428.

The spelling of 667816795 in words is "six hundred sixty-seven million, eight hundred sixteen thousand, seven hundred ninety-five".