12520246561 has 2 divisors, whose sum is σ = 12520246562. Its totient is φ = 12520246560.

The previous prime is 12520246553. The next prime is 12520246597. The reversal of 12520246561 is 16564202521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8261901025 + 4258345536 = 90895^2 + 65256^2 .

It is a cyclic number.

It is not a de Polignac number, because 12520246561 - 2³ = 12520246553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12520246261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260123280 + 6260123281.

It is an arithmetic number, because the mean of its divisors is an integer number (6260123281).

Almost surely, 2^12520246561 is an apocalyptic number.

It is an amenable number.

12520246561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12520246561 is an equidigital number, since it uses as much as digits as its factorization.

12520246561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 34.

It can be divided in two parts, 12520 and 246561, that added together give a square (259081 = 509²).

The spelling of 12520246561 in words is "twelve billion, five hundred twenty million, two hundred forty-six thousand, five hundred sixty-one".