667722207 has 4 divisors (see below), whose sum is σ = 890296280. Its totient is φ = 445148136.

The previous prime is 667722197. The next prime is 667722229. The reversal of 667722207 is 702227766.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 667722207 - 2⁴ = 667722191 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 (667722247) 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, 111287032 + ... + 111287037.

It is an arithmetic number, because the mean of its divisors is an integer number (222574070).

Almost surely, 2^667722207 is an apocalyptic number.

667722207 is a deficient number, since it is larger than the sum of its proper divisors (222574073).

667722207 is a wasteful number, since it uses less digits than its factorization.

667722207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222574072.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 667722207 is about 25840.3213408812. The cubic root of 667722207 is about 874.0412713293.

The spelling of 667722207 in words is "six hundred sixty-seven million, seven hundred twenty-two thousand, two hundred seven".