660430520 has 32 divisors (see below), whose sum is σ = 1504785600. Its totient is φ = 260827008.

The previous prime is 660430513. The next prime is 660430531. The reversal of 660430520 is 25034066.

It is a self number, because there is not a number n which added to its sum of digits gives 660430520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101339 + ... + 107658.

It is an arithmetic number, because the mean of its divisors is an integer number (47024550).

Almost surely, 2^660430520 is an apocalyptic number.

It is an amenable number.

660430520 is an abundant number, since it is smaller than the sum of its proper divisors (844355080).

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

660430520 is a wasteful number, since it uses less digits than its factorization.

660430520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209087 (or 209083 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 660430520 is about 25698.8427755026. The cubic root of 660430520 is about 870.8480390874.

Adding to 660430520 its reverse (25034066), we get a palindrome (685464586).

The spelling of 660430520 in words is "six hundred sixty million, four hundred thirty thousand, five hundred twenty".