660120564 has 12 divisors (see below), whose sum is σ = 1540281344. Its totient is φ = 220040184.

The previous prime is 660120529. The next prime is 660120569. The reversal of 660120564 is 465021066.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660120569) 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, 27505012 + ... + 27505035.

Almost surely, 2^660120564 is an apocalyptic number.

It is an amenable number.

660120564 is an abundant number, since it is smaller than the sum of its proper divisors (880160780).

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

660120564 is a wasteful number, since it uses less digits than its factorization.

660120564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55010054 (or 55010052 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 660120564 is about 25692.8115238485. The cubic root of 660120564 is about 870.7117810935.

The spelling of 660120564 in words is "six hundred sixty million, one hundred twenty thousand, five hundred sixty-four".