660003320 has 16 divisors (see below), whose sum is σ = 1485007560. Its totient is φ = 264001312.

The previous prime is 660003317. The next prime is 660003343. The reversal of 660003320 is 23300066.

It is a happy number.

It is a super-2 number, since 2×660003320² = 871208764822044800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 660003292 and 660003301.

It is a congruent number.

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, 8250002 + ... + 8250081.

Almost surely, 2^660003320 is an apocalyptic number.

It is an amenable number.

660003320 is an abundant number, since it is smaller than the sum of its proper divisors (825004240).

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

660003320 is a wasteful number, since it uses less digits than its factorization.

660003320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500094 (or 16500090 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 660003320 is about 25690.5297726614. The cubic root of 660003320 is about 870.6602290074.

Adding to 660003320 its reverse (23300066), we get a palindrome (683303386).

The spelling of 660003320 in words is "six hundred sixty million, three thousand, three hundred twenty".