6402503665 has 4 divisors (see below), whose sum is σ = 7683004404. Its totient is φ = 5122002928.

The previous prime is 6402503659. The next prime is 6402503669. The reversal of 6402503665 is 5663052046.

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 4807619569 + 1594884096 = 69337^2 + 39936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6402503665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6402503669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640250362 + ... + 640250371.

It is an arithmetic number, because the mean of its divisors is an integer number (1920751101).

Almost surely, 2^6402503665 is an apocalyptic number.

It is an amenable number.

6402503665 is a deficient number, since it is larger than the sum of its proper divisors (1280500739).

6402503665 is a wasteful number, since it uses less digits than its factorization.

6402503665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280500738.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 6402503665 is about 80015.6463761932. The cubic root of 6402503665 is about 1856.8776057049.

The spelling of 6402503665 in words is "six billion, four hundred two million, five hundred three thousand, six hundred sixty-five".