6561116165111 has 16 divisors (see below), whose sum is σ = 6583078656000. Its totient is φ = 6539196367200.

The previous prime is 6561116165101. The next prime is 6561116165117. The reversal of 6561116165111 is 1115616111656.

It is a cyclic number.

It is not a de Polignac number, because 6561116165111 - 2¹⁸ = 6561115902967 is a prime.

It is a super-3 number, since 3×6561116165111³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561116165117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1857093101 + ... + 1857096633.

It is an arithmetic number, because the mean of its divisors is an integer number (411442416000).

Almost surely, 2^{6561116165111} is an apocalyptic number.

6561116165111 is a deficient number, since it is larger than the sum of its proper divisors (21962490889).

6561116165111 is a wasteful number, since it uses less digits than its factorization.

6561116165111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7966.

The product of its digits is 32400, while the sum is 41.

The spelling of 6561116165111 in words is "six trillion, five hundred sixty-one billion, one hundred sixteen million, one hundred sixty-five thousand, one hundred eleven".