6398165778633 has 12 divisors (see below), whose sum is σ = 9242100487620. Its totient is φ = 4265302864416.

The previous prime is 6398165778593. The next prime is 6398165778647. The reversal of 6398165778633 is 3368775618936.

6398165778633 is a `hidden beast` number, since 6 + 3 + 9 + 8 + 16 + 577 + 8 + 6 + 33 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3426689681424 + 2971476097209 = 1851132^2 + 1723797^2 .

It is not a de Polignac number, because 6398165778633 - 2³⁴ = 6380985909449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6398165578633) 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, 11461218 + ... + 12006491.

It is an arithmetic number, because the mean of its divisors is an integer number (770175040635).

Almost surely, 2^{6398165778633} is an apocalyptic number.

It is an amenable number.

6398165778633 is a deficient number, since it is larger than the sum of its proper divisors (2843934708987).

6398165778633 is a wasteful number, since it uses less digits than its factorization.

6398165778633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23498008 (or 23498005 counting only the distinct ones).

The product of its digits is 823011840, while the sum is 72.

The spelling of 6398165778633 in words is "six trillion, three hundred ninety-eight billion, one hundred sixty-five million, seven hundred seventy-eight thousand, six hundred thirty-three".