667707671 has 4 divisors (see below), whose sum is σ = 702850200. Its totient is φ = 632565144.

The previous prime is 667707659. The next prime is 667707739. The reversal of 667707671 is 176707766.

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 667707671 - 2²⁶ = 600598807 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 (667707631) 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, 17571236 + ... + 17571273.

It is an arithmetic number, because the mean of its divisors is an integer number (175712550).

Almost surely, 2^667707671 is an apocalyptic number.

667707671 is a deficient number, since it is larger than the sum of its proper divisors (35142529).

667707671 is a wasteful number, since it uses less digits than its factorization.

667707671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35142528.

The product of its (nonzero) digits is 518616, while the sum is 47.

The square root of 667707671 is about 25840.0400734983. The cubic root of 667707671 is about 874.0349287934.

The spelling of 667707671 in words is "six hundred sixty-seven million, seven hundred seven thousand, six hundred seventy-one".