666344199 has 8 divisors (see below), whose sum is σ = 892373760. Its totient is φ = 442272056.

The previous prime is 666344197. The next prime is 666344221. The reversal of 666344199 is 991443666.

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 666344199 - 2¹ = 666344197 is a prime.

It is a super-5 number, since 5×666344199⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666344191) 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, 488559 + ... + 489920.

It is an arithmetic number, because the mean of its divisors is an integer number (111546720).

Almost surely, 2^666344199 is an apocalyptic number.

666344199 is a deficient number, since it is larger than the sum of its proper divisors (226029561).

666344199 is a wasteful number, since it uses less digits than its factorization.

666344199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978709.

The product of its digits is 839808, while the sum is 48.

The square root of 666344199 is about 25813.6436598943. The cubic root of 666344199 is about 873.4395912932.

It can be divided in two parts, 666 and 344199, that added together give a triangular number (344865 = T₈₃₀).

The spelling of 666344199 in words is "six hundred sixty-six million, three hundred forty-four thousand, one hundred ninety-nine".