12689541220 has 12 divisors (see below), whose sum is σ = 26648036604. Its totient is φ = 5075816480.

The previous prime is 12689541211. The next prime is 12689541239. The reversal of 12689541220 is 2214598621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4638427236 + 8051113984 = 68106^2 + 89728^2 .

It is a super-2 number, since 2×12689541220² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317238511 + ... + 317238550.

It is an arithmetic number, because the mean of its divisors is an integer number (2220669717).

Almost surely, 2^12689541220 is an apocalyptic number.

12689541220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12689541220 is an abundant number, since it is smaller than the sum of its proper divisors (13958495384).

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

12689541220 is a wasteful number, since it uses less digits than its factorization.

12689541220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634477070 (or 634477068 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 12689541220 in words is "twelve billion, six hundred eighty-nine million, five hundred forty-one thousand, two hundred twenty".