667813567 has 4 divisors (see below), whose sum is σ = 707096736. Its totient is φ = 628530400.

The previous prime is 667813477. The next prime is 667813571. The reversal of 667813567 is 765318766.

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 667813567 - 2¹⁹ = 667289279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667813567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667813667) 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, 19641559 + ... + 19641592.

It is an arithmetic number, because the mean of its divisors is an integer number (176774184).

Almost surely, 2^667813567 is an apocalyptic number.

667813567 is a deficient number, since it is larger than the sum of its proper divisors (39283169).

667813567 is a wasteful number, since it uses less digits than its factorization.

667813567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39283168.

The product of its digits is 1270080, while the sum is 49.

The square root of 667813567 is about 25842.0890602908. The cubic root of 667813567 is about 874.0811326010.

The spelling of 667813567 in words is "six hundred sixty-seven million, eight hundred thirteen thousand, five hundred sixty-seven".