12181979907 has 16 divisors (see below), whose sum is σ = 18069663360. Its totient is φ = 8111291400.

The previous prime is 12181979897. The next prime is 12181979933. The reversal of 12181979907 is 70997918121.

It is not a de Polignac number, because 12181979907 - 2¹⁰ = 12181978883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12181979977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256269 + ... + 300062.

It is an arithmetic number, because the mean of its divisors is an integer number (1129353960).

Almost surely, 2^12181979907 is an apocalyptic number.

12181979907 is a deficient number, since it is larger than the sum of its proper divisors (5887683453).

12181979907 is an equidigital number, since it uses as much as digits as its factorization.

12181979907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557151 (or 557145 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 54.

The spelling of 12181979907 in words is "twelve billion, one hundred eighty-one million, nine hundred seventy-nine thousand, nine hundred seven".