666540196 has 24 divisors (see below), whose sum is σ = 1343584256. Its totient is φ = 283409280.

The previous prime is 666540179. The next prime is 666540221. The reversal of 666540196 is 691045666.

666540196 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 90165 + ... + 97276.

Almost surely, 2^666540196 is an apocalyptic number.

It is an amenable number.

666540196 is an abundant number, since it is smaller than the sum of its proper divisors (677044060).

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

666540196 is a wasteful number, since it uses less digits than its factorization.

666540196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187579 (or 187577 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 666540196 is about 25817.4397646242. The cubic root of 666540196 is about 873.5252200909.

The spelling of 666540196 in words is "six hundred sixty-six million, five hundred forty thousand, one hundred ninety-six".