660016520 has 16 divisors (see below), whose sum is σ = 1485037260. Its totient is φ = 264006592.

The previous prime is 660016501. The next prime is 660016541. The reversal of 660016520 is 25610066.

It can be written as a sum of positive squares in 2 ways, for example, as 654643396 + 5373124 = 25586^2 + 2318^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 660016520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8250167 + ... + 8250246.

Almost surely, 2^660016520 is an apocalyptic number.

It is an amenable number.

660016520 is an abundant number, since it is smaller than the sum of its proper divisors (825020740).

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

660016520 is a wasteful number, since it uses less digits than its factorization.

660016520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500424 (or 16500420 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 660016520 is about 25690.7866753823. The cubic root of 660016520 is about 870.6660333410. Note that the first 3 decimals are identical.

Adding to 660016520 its reverse (25610066), we get a palindrome (685626586).

The spelling of 660016520 in words is "six hundred sixty million, sixteen thousand, five hundred twenty".