12115856385105 has 48 divisors (see below), whose sum is σ = 21312455149440. Its totient is φ = 5873095022080.

The previous prime is 12115856385077. The next prime is 12115856385239. The reversal of 12115856385105 is 50158365851121.

It is not a de Polignac number, because 12115856385105 - 2⁴³ = 3319763362897 is a prime.

It is a super-2 number, since 2×12115856385105² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7779049 + ... + 9205721.

It is an arithmetic number, because the mean of its divisors is an integer number (444009482280).

Almost surely, 2^{12115856385105} is an apocalyptic number.

12115856385105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12115856385105 is a deficient number, since it is larger than the sum of its proper divisors (9196598764335).

12115856385105 is a wasteful number, since it uses less digits than its factorization.

12115856385105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431382 (or 1431371 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 51.

The spelling of 12115856385105 in words is "twelve trillion, one hundred fifteen billion, eight hundred fifty-six million, three hundred eighty-five thousand, one hundred five".