12165117566 has 16 divisors (see below), whose sum is σ = 20901573504. Its totient is φ = 5201850264.

The previous prime is 12165117553. The next prime is 12165117581. The reversal of 12165117566 is 66571156121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974540 + ... + 986943.

It is an arithmetic number, because the mean of its divisors is an integer number (1306348344).

Almost surely, 2^12165117566 is an apocalyptic number.

12165117566 is a deficient number, since it is larger than the sum of its proper divisors (8736455938).

12165117566 is a wasteful number, since it uses less digits than its factorization.

12165117566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961935.

The product of its digits is 75600, while the sum is 41.

The spelling of 12165117566 in words is "twelve billion, one hundred sixty-five million, one hundred seventeen thousand, five hundred sixty-six".