12660681536 has 14 divisors (see below), whose sum is σ = 25123540050. Its totient is φ = 6330340736.

The previous prime is 12660681529. The next prime is 12660681547. The reversal of 12660681536 is 63518606621.

It can be written as a sum of positive squares in only one way, i.e., 12038478400 + 622203136 = 109720^2 + 24944^2 .

It is a super-2 number, since 2×12660681536² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98911511 + ... + 98911638.

It is an arithmetic number, because the mean of its divisors is an integer number (1794538575).

Almost surely, 2^12660681536 is an apocalyptic number.

12660681536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12660681536 is a deficient number, since it is larger than the sum of its proper divisors (12462858514).

12660681536 is an equidigital number, since it uses as much as digits as its factorization.

12660681536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197823161 (or 197823151 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 12660681536 in words is "twelve billion, six hundred sixty million, six hundred eighty-one thousand, five hundred thirty-six".