199960645 has 4 divisors (see below), whose sum is σ = 239952780. Its totient is φ = 159968512.

The previous prime is 199960639. The next prime is 199960667. The reversal of 199960645 is 546069991.

199960645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154181889 + 45778756 = 12417^2 + 6766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199960645 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19996060 + ... + 19996069.

It is an arithmetic number, because the mean of its divisors is an integer number (59988195).

Almost surely, 2^199960645 is an apocalyptic number.

It is an amenable number.

199960645 is a deficient number, since it is larger than the sum of its proper divisors (39992135).

199960645 is an equidigital number, since it uses as much as digits as its factorization.

199960645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39992134.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 199960645 is about 14140.7441459069. The cubic root of 199960645 is about 584.7651868870.

The spelling of 199960645 in words is "one hundred ninety-nine million, nine hundred sixty thousand, six hundred forty-five".