660513 has 16 divisors (see below), whose sum is σ = 1022976. Its totient is φ = 371280.

The previous prime is 660509. The next prime is 660521. The reversal of 660513 is 315066.

It is not a de Polignac number, because 660513 - 2² = 660509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 660513.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660513.

It is not an unprimeable number, because it can be changed into a prime (660503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270 + ... + 1712.

It is an arithmetic number, because the mean of its divisors is an integer number (63936).

2⁶⁶⁰⁵¹³ is an apocalyptic number.

It is an amenable number.

660513 is a deficient number, since it is larger than the sum of its proper divisors (362463).

660513 is a wasteful number, since it uses less digits than its factorization.

660513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 660513 is about 812.7195088098. The cubic root of 660513 is about 87.0884290469.

Adding to 660513 its reverse (315066), we get a palindrome (975579).

The spelling of 660513 in words is "six hundred sixty thousand, five hundred thirteen".