12161191667 has 4 divisors (see below), whose sum is σ = 12297834360. Its totient is φ = 12024548976.

The previous prime is 12161191639. The next prime is 12161191681. The reversal of 12161191667 is 76619116121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12161191667 - 2¹⁸ = 12160929523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12161191607) 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, 68321213 + ... + 68321390.

It is an arithmetic number, because the mean of its divisors is an integer number (3074458590).

Almost surely, 2^12161191667 is an apocalyptic number.

12161191667 is a deficient number, since it is larger than the sum of its proper divisors (136642693).

12161191667 is an equidigital number, since it uses as much as digits as its factorization.

12161191667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136642692.

The product of its digits is 27216, while the sum is 41.

The spelling of 12161191667 in words is "twelve billion, one hundred sixty-one million, one hundred ninety-one thousand, six hundred sixty-seven".