660640652 has 24 divisors (see below), whose sum is σ = 1324458240. Its totient is φ = 282450960.

The previous prime is 660640637. The next prime is 660640709. The reversal of 660640652 is 256046066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16424 + ... + 39887.

It is an arithmetic number, because the mean of its divisors is an integer number (55185760).

Almost surely, 2^660640652 is an apocalyptic number.

It is an amenable number.

660640652 is an abundant number, since it is smaller than the sum of its proper divisors (663817588).

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

660640652 is a wasteful number, since it uses less digits than its factorization.

660640652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56741 (or 56739 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 660640652 is about 25702.9308056494. The cubic root of 660640652 is about 870.9403897738.

The spelling of 660640652 in words is "six hundred sixty million, six hundred forty thousand, six hundred fifty-two".