2161640313226 has 16 divisors (see below), whose sum is σ = 3272920499520. Its totient is φ = 1070667780640.

The previous prime is 2161640313199. The next prime is 2161640313227. The reversal of 2161640313226 is 6223130461612.

It is not an unprimeable number, because it can be changed into a prime (2161640313227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4451715 + ... + 4913353.

It is an arithmetic number, because the mean of its divisors is an integer number (204557531220).

Almost surely, 2^{2161640313226} is an apocalyptic number.

2161640313226 is a deficient number, since it is larger than the sum of its proper divisors (1111280186294).

2161640313226 is a wasteful number, since it uses less digits than its factorization.

2161640313226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483629.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 2161640313226 its reverse (6223130461612), we get a palindrome (8384770774838).

The spelling of 2161640313226 in words is "two trillion, one hundred sixty-one billion, six hundred forty million, three hundred thirteen thousand, two hundred twenty-six".