666195140 has 24 divisors (see below), whose sum is σ = 1506626520. Its totient is φ = 245979648.

The previous prime is 666195077. The next prime is 666195191. The reversal of 666195140 is 41591666.

666195140 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8375236 + 657819904 = 2894^2 + 25648^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666195094 and 666195103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280885 + ... + 1281404.

It is an arithmetic number, because the mean of its divisors is an integer number (62776105).

Almost surely, 2^666195140 is an apocalyptic number.

It is an amenable number.

666195140 is an abundant number, since it is smaller than the sum of its proper divisors (840431380).

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

666195140 is a wasteful number, since it uses less digits than its factorization.

666195140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562311 (or 2562309 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 666195140 is about 25810.7562849290. The cubic root of 666195140 is about 873.3744579175.

The spelling of 666195140 in words is "six hundred sixty-six million, one hundred ninety-five thousand, one hundred forty".