667128199 has 8 divisors (see below), whose sum is σ = 682607808. Its totient is φ = 651702240.

The previous prime is 667128181. The next prime is 667128211. The reversal of 667128199 is 991821766.

667128199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667128199 - 2¹¹ = 667126151 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 (667128149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12309 + ... + 38545.

It is an arithmetic number, because the mean of its divisors is an integer number (85325976).

Almost surely, 2^667128199 is an apocalyptic number.

667128199 is a deficient number, since it is larger than the sum of its proper divisors (15479609).

667128199 is a wasteful number, since it uses less digits than its factorization.

667128199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26825.

The product of its digits is 326592, while the sum is 49.

The square root of 667128199 is about 25828.8249635945. The cubic root of 667128199 is about 873.7820110485.

The spelling of 667128199 in words is "six hundred sixty-seven million, one hundred twenty-eight thousand, one hundred ninety-nine".