6616562656165 has 64 divisors (see below), whose sum is σ = 10199174211072. Its totient is φ = 4001417625600.

The previous prime is 6616562656163. The next prime is 6616562656169. The reversal of 6616562656165 is 5616562656166.

It is not a de Polignac number, because 6616562656165 - 2¹ = 6616562656163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616562656163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 215292 + ... + 3644101.

It is an arithmetic number, because the mean of its divisors is an integer number (159362097048).

Almost surely, 2^{6616562656165} is an apocalyptic number.

It is an amenable number.

6616562656165 is a deficient number, since it is larger than the sum of its proper divisors (3582611554907).

6616562656165 is a wasteful number, since it uses less digits than its factorization.

6616562656165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859550.

The product of its digits is 69984000, while the sum is 61.

Subtracting from 6616562656165 its reverse (5616562656166), we obtain a palindrome (999999999999).

It can be divided in two parts, 6616562 and 656165, that added together give a palindrome (7272727).

The spelling of 6616562656165 in words is "six trillion, six hundred sixteen billion, five hundred sixty-two million, six hundred fifty-six thousand, one hundred sixty-five".