666734140 has 24 divisors (see below), whose sum is σ = 1408532832. Its totient is φ = 265095360.

The previous prime is 666734129. The next prime is 666734183. The reversal of 666734140 is 41437666.

It is a self number, because there is not a number n which added to its sum of digits gives 666734140.

It is a congruent number.

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, 96471 + ... + 103150.

It is an arithmetic number, because the mean of its divisors is an integer number (58688868).

Almost surely, 2^666734140 is an apocalyptic number.

It is an amenable number.

666734140 is an abundant number, since it is smaller than the sum of its proper divisors (741798692).

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

666734140 is a wasteful number, since it uses less digits than its factorization.

666734140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199797 (or 199795 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 666734140 is about 25821.1955571387. The cubic root of 666734140 is about 873.6099354350.

The spelling of 666734140 in words is "six hundred sixty-six million, seven hundred thirty-four thousand, one hundred forty".