665720195 has 64 divisors (see below), whose sum is σ = 1016463360. Its totient is φ = 408240000.

The previous prime is 665720161. The next prime is 665720203. The reversal of 665720195 is 591027566.

665720195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665720195 - 2⁶ = 665720131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 886070 + ... + 886820.

It is an arithmetic number, because the mean of its divisors is an integer number (15882240).

Almost surely, 2^665720195 is an apocalyptic number.

665720195 is a deficient number, since it is larger than the sum of its proper divisors (350743165).

665720195 is a wasteful number, since it uses less digits than its factorization.

665720195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 665720195 is about 25801.5541198587. The cubic root of 665720195 is about 873.1668593624.

The spelling of 665720195 in words is "six hundred sixty-five million, seven hundred twenty thousand, one hundred ninety-five".