666957116 has 24 divisors (see below), whose sum is σ = 1369968096. Its totient is φ = 278112960.

The previous prime is 666957113. The next prime is 666957131. The reversal of 666957116 is 611759666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666957113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320855 + ... + 322926.

It is an arithmetic number, because the mean of its divisors is an integer number (57082004).

Almost surely, 2^666957116 is an apocalyptic number.

It is an amenable number.

666957116 is an abundant number, since it is smaller than the sum of its proper divisors (703010980).

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

666957116 is a wasteful number, since it uses less digits than its factorization.

666957116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643829 (or 643827 counting only the distinct ones).

The product of its digits is 408240, while the sum is 47.

The square root of 666957116 is about 25825.5128893891. The cubic root of 666957116 is about 873.7073117486.

The spelling of 666957116 in words is "six hundred sixty-six million, nine hundred fifty-seven thousand, one hundred sixteen".