660769216 has 28 divisors (see below), whose sum is σ = 1353515200. Its totient is φ = 319726080.

The previous prime is 660769181. The next prime is 660769217. The reversal of 660769216 is 612967066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660769217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164541 + ... + 168508.

Almost surely, 2^660769216 is an apocalyptic number.

It is an amenable number.

660769216 is an abundant number, since it is smaller than the sum of its proper divisors (692745984).

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

660769216 is a wasteful number, since it uses less digits than its factorization.

660769216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333092 (or 333082 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 660769216 is about 25705.4316439153. The cubic root of 660769216 is about 870.9968825723.

The spelling of 660769216 in words is "six hundred sixty million, seven hundred sixty-nine thousand, two hundred sixteen".