12155120185820 has 24 divisors (see below), whose sum is σ = 26635567712544. Its totient is φ = 4650654679616.

The previous prime is 12155120185799. The next prime is 12155120185907. The reversal of 12155120185820 is 2858102155121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13212086699 + ... + 13212087618.

It is an arithmetic number, because the mean of its divisors is an integer number (1109815321356).

Almost surely, 2^{12155120185820} is an apocalyptic number.

12155120185820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155120185820 is an abundant number, since it is smaller than the sum of its proper divisors (14480447526724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12155120185820 is a wasteful number, since it uses less digits than its factorization.

12155120185820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26424174349 (or 26424174347 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 41.

The spelling of 12155120185820 in words is "twelve trillion, one hundred fifty-five billion, one hundred twenty million, one hundred eighty-five thousand, eight hundred twenty".