660199813 has 16 divisors (see below), whose sum is σ = 816659200. Its totient is φ = 519716736.

The previous prime is 660199801. The next prime is 660199817. The reversal of 660199813 is 318991066.

It is not a de Polignac number, because 660199813 - 2⁵ = 660199781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660199813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660199817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120 + ... + 36337.

It is an arithmetic number, because the mean of its divisors is an integer number (51041200).

Almost surely, 2^660199813 is an apocalyptic number.

It is an amenable number.

660199813 is a deficient number, since it is larger than the sum of its proper divisors (156459387).

660199813 is a wasteful number, since it uses less digits than its factorization.

660199813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36676.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 660199813 is about 25694.3537182783. The cubic root of 660199813 is about 870.7466233534.

The spelling of 660199813 in words is "six hundred sixty million, one hundred ninety-nine thousand, eight hundred thirteen".