665062513 has 4 divisors (see below), whose sum is σ = 667160820. Its totient is φ = 662964208.

The previous prime is 665062511. The next prime is 665062537. The reversal of 665062513 is 315260566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163660849 + 501401664 = 12793^2 + 22392^2 .

It is a cyclic number.

It is not a de Polignac number, because 665062513 - 2¹ = 665062511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665062511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048678 + ... + 1049311.

It is an arithmetic number, because the mean of its divisors is an integer number (166790205).

Almost surely, 2^665062513 is an apocalyptic number.

It is an amenable number.

665062513 is a deficient number, since it is larger than the sum of its proper divisors (2098307).

665062513 is a wasteful number, since it uses less digits than its factorization.

665062513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098306.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 665062513 is about 25788.8059630530. The cubic root of 665062513 is about 872.8792233329.

The spelling of 665062513 in words is "six hundred sixty-five million, sixty-two thousand, five hundred thirteen".