199551066 has 64 divisors (see below), whose sum is σ = 496492416. Its totient is φ = 52531200.

The previous prime is 199550993. The next prime is 199551073. The reversal of 199551066 is 660155991.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7746 + ... + 21426.

It is an arithmetic number, because the mean of its divisors is an integer number (7757694).

Almost surely, 2^199551066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199551066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248246208).

199551066 is an abundant number, since it is smaller than the sum of its proper divisors (296941350).

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

199551066 is a wasteful number, since it uses less digits than its factorization.

199551066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13727.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 199551066 is about 14126.2544929645. The cubic root of 199551066 is about 584.3656561786.

The spelling of 199551066 in words is "one hundred ninety-nine million, five hundred fifty-one thousand, sixty-six".