199501866 has 80 divisors (see below), whose sum is σ = 459862920. Its totient is φ = 64627200.

The previous prime is 199501853. The next prime is 199501867. The reversal of 199501866 is 668105991.

It can be written as a sum of positive squares in 4 ways, for example, as 189860841 + 9641025 = 13779^2 + 3105^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199501867) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1456150 + ... + 1456286.

Almost surely, 2^199501866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199501866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229931460).

199501866 is an abundant number, since it is smaller than the sum of its proper divisors (260361054).

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

199501866 is a wasteful number, since it uses less digits than its factorization.

199501866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 199501866 is about 14124.5129473550. The cubic root of 199501866 is about 584.3176264452.

The spelling of 199501866 in words is "one hundred ninety-nine million, five hundred one thousand, eight hundred sixty-six".