12165065775 has 18 divisors (see below), whose sum is σ = 21788984880. Its totient is φ = 6488034960.

The previous prime is 12165065729. The next prime is 12165065807. The reversal of 12165065775 is 57756056121.

12165065775 is a `hidden beast` number, since 1 + 21 + 6 + 50 + 6 + 577 + 5 = 666.

It is not a de Polignac number, because 12165065775 - 2⁶ = 12165065711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12165065775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 27033255 + ... + 27033704.

It is an arithmetic number, because the mean of its divisors is an integer number (1210499160).

Almost surely, 2^12165065775 is an apocalyptic number.

12165065775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12165065775 is a deficient number, since it is larger than the sum of its proper divisors (9623919105).

12165065775 is a wasteful number, since it uses less digits than its factorization.

12165065775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54066975 (or 54066967 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 12165065775 in words is "twelve billion, one hundred sixty-five million, sixty-five thousand, seven hundred seventy-five".