6665513 has 8 divisors (see below), whose sum is σ = 7249032. Its totient is φ = 6103296.

The previous prime is 6665497. The next prime is 6665537. The reversal of 6665513 is 3155666.

It can be written as a sum of positive squares in 4 ways, for example, as 1338649 + 5326864 = 1157^2 + 2308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6665513 - 2⁴ = 6665497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6665513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4670 + ... + 5927.

It is an arithmetic number, because the mean of its divisors is an integer number (906129).

Almost surely, 2^6665513 is an apocalyptic number.

It is an amenable number.

6665513 is a deficient number, since it is larger than the sum of its proper divisors (583519).

6665513 is a wasteful number, since it uses less digits than its factorization.

6665513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10651.

The product of its digits is 16200, while the sum is 32.

The square root of 6665513 is about 2581.7654812163. The cubic root of 6665513 is about 188.1963487309.

The spelling of 6665513 in words is "six million, six hundred sixty-five thousand, five hundred thirteen".