12180979905 has 8 divisors (see below), whose sum is σ = 19489567872. Its totient is φ = 6496522608.

The previous prime is 12180979903. The next prime is 12180979949. The reversal of 12180979905 is 50997908121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12180979905 - 2¹ = 12180979903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12180979903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406032649 + ... + 406032678.

It is an arithmetic number, because the mean of its divisors is an integer number (2436195984).

Almost surely, 2^12180979905 is an apocalyptic number.

12180979905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12180979905 is a deficient number, since it is larger than the sum of its proper divisors (7308587967).

12180979905 is an equidigital number, since it uses as much as digits as its factorization.

12180979905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812065335.

The product of its (nonzero) digits is 408240, while the sum is 51.

The spelling of 12180979905 in words is "twelve billion, one hundred eighty million, nine hundred seventy-nine thousand, nine hundred five".