667699199 has 4 divisors (see below), whose sum is σ = 672121200. Its totient is φ = 663277200.

The previous prime is 667699189. The next prime is 667699213. The reversal of 667699199 is 991996766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991996766 = 2 ⋅495998383.

It is a cyclic number.

It is not a de Polignac number, because 667699199 - 2¹² = 667695103 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 (667699139) 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, 2210774 + ... + 2211075.

It is an arithmetic number, because the mean of its divisors is an integer number (168030300).

Almost surely, 2^667699199 is an apocalyptic number.

667699199 is a deficient number, since it is larger than the sum of its proper divisors (4422001).

667699199 is a wasteful number, since it uses less digits than its factorization.

667699199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422000.

The product of its digits is 9920232, while the sum is 62.

The square root of 667699199 is about 25839.8761413440. The cubic root of 667699199 is about 874.0312321382.

The spelling of 667699199 in words is "six hundred sixty-seven million, six hundred ninety-nine thousand, one hundred ninety-nine".