12520459461861 has 48 divisors (see below), whose sum is σ = 19796544658800. Its totient is φ = 7578208834560.

The previous prime is 12520459461833. The next prime is 12520459461869. The reversal of 12520459461861 is 16816495402521.

It is a happy number.

12520459461861 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 0 + 459 + 4 + 6 + 186 + 1 = 666.

12520459461861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 9452027592225 + 3068431869636 = 3074415^2 + 1751694^2 .

It is not a de Polignac number, because 12520459461861 - 2⁷ = 12520459461733 is a prime.

It is a super-2 number, since 2×12520459461861² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12520459461798 and 12520459461807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520459461869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 219055915 + ... + 219113063.

It is an arithmetic number, because the mean of its divisors is an integer number (412428013725).

Almost surely, 2^{12520459461861} is an apocalyptic number.

It is an amenable number.

12520459461861 is a deficient number, since it is larger than the sum of its proper divisors (7276085196939).

12520459461861 is a wasteful number, since it uses less digits than its factorization.

12520459461861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87926 (or 87923 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 12520459461861 in words is "twelve trillion, five hundred twenty billion, four hundred fifty-nine million, four hundred sixty-one thousand, eight hundred sixty-one".