12178840091 has 24 divisors (see below), whose sum is σ = 13518822240. Its totient is φ = 10962807680.

The previous prime is 12178840067. The next prime is 12178840097. The reversal of 12178840091 is 19004887121.

It is not a de Polignac number, because 12178840091 - 2⁶ = 12178840027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12178840097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9232730 + ... + 9234048.

It is an arithmetic number, because the mean of its divisors is an integer number (563284260).

Almost surely, 2^12178840091 is an apocalyptic number.

12178840091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12178840091 is a deficient number, since it is larger than the sum of its proper divisors (1339982149).

12178840091 is a wasteful number, since it uses less digits than its factorization.

12178840091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 41.

The spelling of 12178840091 in words is "twelve billion, one hundred seventy-eight million, eight hundred forty thousand, ninety-one".