660841668 has 36 divisors (see below), whose sum is σ = 1673854000. Its totient is φ = 219833136.

The previous prime is 660841639. The next prime is 660841669. The reversal of 660841668 is 866148066.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (660841669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430 + ... + 36357.

Almost surely, 2^660841668 is an apocalyptic number.

It is an amenable number.

660841668 is an abundant number, since it is smaller than the sum of its proper divisors (1013012332).

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

660841668 is a wasteful number, since it uses less digits than its factorization.

660841668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37296 (or 37291 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 660841668 is about 25706.8408794235. The cubic root of 660841668 is about 871.0287157541.

The spelling of 660841668 in words is "six hundred sixty million, eight hundred forty-one thousand, six hundred sixty-eight".