660653660 has 48 divisors (see below), whose sum is σ = 1476105120. Its totient is φ = 247511040.

The previous prime is 660653629. The next prime is 660653663. The reversal of 660653660 is 66356066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660653663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67136 + ... + 76344.

It is an arithmetic number, because the mean of its divisors is an integer number (30752190).

Almost surely, 2^660653660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660653660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738052560).

660653660 is an abundant number, since it is smaller than the sum of its proper divisors (815451460).

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

660653660 is a wasteful number, since it uses less digits than its factorization.

660653660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446 (or 9444 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 660653660 is about 25703.1838494767. The cubic root of 660653660 is about 870.9461060021.

The spelling of 660653660 in words is "six hundred sixty million, six hundred fifty-three thousand, six hundred sixty".