6402643605 has 12 divisors (see below), whose sum is σ = 11097915660. Its totient is φ = 3414743232.

The previous prime is 6402643603. The next prime is 6402643657. The reversal of 6402643605 is 5063462046.

6402643605 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 6 + 43 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1716693489 + 4685950116 = 41433^2 + 68454^2 .

It is not a de Polignac number, because 6402643605 - 2¹ = 6402643603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6402643605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402643601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71140440 + ... + 71140529.

It is an arithmetic number, because the mean of its divisors is an integer number (924826305).

Almost surely, 2^6402643605 is an apocalyptic number.

It is an amenable number.

6402643605 is a deficient number, since it is larger than the sum of its proper divisors (4695272055).

6402643605 is a wasteful number, since it uses less digits than its factorization.

6402643605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142280980 (or 142280977 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 6402643605 is about 80016.5208253896. The cubic root of 6402643605 is about 1856.8911342437.

The spelling of 6402643605 in words is "six billion, four hundred two million, six hundred forty-three thousand, six hundred five".