12167165561 has 4 divisors (see below), whose sum is σ = 12426041472. Its totient is φ = 11908289652.

The previous prime is 12167165537. The next prime is 12167165579. The reversal of 12167165561 is 16556176121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12167165561 - 2⁶ = 12167165497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12167965561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129437885 + ... + 129437978.

It is an arithmetic number, because the mean of its divisors is an integer number (3106510368).

Almost surely, 2^12167165561 is an apocalyptic number.

It is an amenable number.

12167165561 is a deficient number, since it is larger than the sum of its proper divisors (258875911).

12167165561 is an equidigital number, since it uses as much as digits as its factorization.

12167165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258875910.

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

The spelling of 12167165561 in words is "twelve billion, one hundred sixty-seven million, one hundred sixty-five thousand, five hundred sixty-one".