660327521 has 8 divisors (see below), whose sum is σ = 755780160. Its totient is φ = 565154928.

The previous prime is 660327461. The next prime is 660327523. The reversal of 660327521 is 125723066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660327521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660327523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64931 + ... + 74408.

It is an arithmetic number, because the mean of its divisors is an integer number (94472520).

Almost surely, 2^660327521 is an apocalyptic number.

It is an amenable number.

660327521 is a deficient number, since it is larger than the sum of its proper divisors (95452639).

660327521 is a wasteful number, since it uses less digits than its factorization.

660327521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140023.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 660327521 is about 25696.8387355332. The cubic root of 660327521 is about 870.8027650134.

The spelling of 660327521 in words is "six hundred sixty million, three hundred twenty-seven thousand, five hundred twenty-one".