12520716660 has 36 divisors (see below), whose sum is σ = 37979507748. Its totient is φ = 3338857728.

The previous prime is 12520716623. The next prime is 12520716673. The reversal of 12520716660 is 6661702521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2040690276 + 10480026384 = 45174^2 + 102372^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34779589 + ... + 34779948.

Almost surely, 2^12520716660 is an apocalyptic number.

12520716660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12520716660 is an abundant number, since it is smaller than the sum of its proper divisors (25458791088).

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

12520716660 is a wasteful number, since it uses less digits than its factorization.

12520716660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69559552 (or 69559547 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 12520716660 in words is "twelve billion, five hundred twenty million, seven hundred sixteen thousand, six hundred sixty".