12256515145220 has 48 divisors (see below), whose sum is σ = 26317642922928. Its totient is φ = 4792986132480.

The previous prime is 12256515145211. The next prime is 12256515145271. The reversal of 12256515145220 is 2254151565221.

It can be written as a sum of positive squares in 8 ways, for example, as 1464869661124 + 10791645484096 = 1210318^2 + 3285064^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20276429 + ... + 20872148.

It is an arithmetic number, because the mean of its divisors is an integer number (548284227561).

Almost surely, 2^{12256515145220} is an apocalyptic number.

12256515145220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12256515145220 is an abundant number, since it is smaller than the sum of its proper divisors (14061127777708).

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

12256515145220 is a wasteful number, since it uses less digits than its factorization.

12256515145220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41148920 (or 41148918 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 41.

The spelling of 12256515145220 in words is "twelve trillion, two hundred fifty-six billion, five hundred fifteen million, one hundred forty-five thousand, two hundred twenty".