66195790 has 32 divisors (see below), whose sum is σ = 126624384. Its totient is φ = 24829440.

The previous prime is 66195769. The next prime is 66195793. The reversal of 66195790 is 9759166.

66195790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66195790² = 8763765227448200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66195793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61860 + ... + 62920.

It is an arithmetic number, because the mean of its divisors is an integer number (3957012).

Almost surely, 2^66195790 is an apocalyptic number.

66195790 is a deficient number, since it is larger than the sum of its proper divisors (60428594).

66195790 is a wasteful number, since it uses less digits than its factorization.

66195790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 66195790 is about 8136.0795227185. The cubic root of 66195790 is about 404.5232208842.

The spelling of 66195790 in words is "sixty-six million, one hundred ninety-five thousand, seven hundred ninety".