667699198 has 8 divisors (see below), whose sum is σ = 1009435392. Its totient is φ = 331220736.

The previous prime is 667699189. The next prime is 667699213. The reversal of 667699198 is 891996766.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314115 + ... + 1314622.

It is an arithmetic number, because the mean of its divisors is an integer number (126179424).

Almost surely, 2^667699198 is an apocalyptic number.

667699198 is a deficient number, since it is larger than the sum of its proper divisors (341736194).

667699198 is a wasteful number, since it uses less digits than its factorization.

667699198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628866.

The product of its digits is 8817984, while the sum is 61.

The square root of 667699198 is about 25839.8761219941. The cubic root of 667699198 is about 874.0312317018.

The spelling of 667699198 in words is "six hundred sixty-seven million, six hundred ninety-nine thousand, one hundred ninety-eight".