806199966 has 120 divisors (see below), whose sum is σ = 2134762344. Its totient is φ = 225426240.

The previous prime is 806199949. The next prime is 806199997. The reversal of 806199966 is 669991608.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 299820 + ... + 302496.

Almost surely, 2^806199966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 806199966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067381172).

806199966 is an abundant number, since it is smaller than the sum of its proper divisors (1328562378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

806199966 is a wasteful number, since it uses less digits than its factorization.

806199966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728 (or 2706 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 806199966 is about 28393.6606657190. The cubic root of 806199966 is about 930.7097391747.

The spelling of 806199966 in words is "eight hundred six million, one hundred ninety-nine thousand, nine hundred sixty-six".