660522330 has 128 divisors (see below), whose sum is σ = 1907539200. Its totient is φ = 161678592.

The previous prime is 660522307. The next prime is 660522353. The reversal of 660522330 is 33225066.

660522330 is a `hidden beast` number, since 6 + 605 + 2 + 23 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (660522307) and next prime (660522353).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 660522294 and 660522303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 796356 + ... + 797184.

It is an arithmetic number, because the mean of its divisors is an integer number (14902650).

Almost surely, 2^660522330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660522330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953769600).

660522330 is an abundant number, since it is smaller than the sum of its proper divisors (1247016870).

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

660522330 is a wasteful number, since it uses less digits than its factorization.

660522330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 660522330 is about 25700.6289806300. The cubic root of 660522330 is about 870.8883909747. Note that the first 3 decimals are identical.

Adding to 660522330 its reverse (33225066), we get a palindrome (693747396).

The spelling of 660522330 in words is "six hundred sixty million, five hundred twenty-two thousand, three hundred thirty".