12549980557 has 2 divisors, whose sum is σ = 12549980558. Its totient is φ = 12549980556.

The previous prime is 12549980537. The next prime is 12549980587. The reversal of 12549980557 is 75508994521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9303374116 + 3246606441 = 96454^2 + 56979^2 .

It is a cyclic number.

It is not a de Polignac number, because 12549980557 - 2¹¹ = 12549978509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12549980498 and 12549980507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12549980537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6274990278 + 6274990279.

It is an arithmetic number, because the mean of its divisors is an integer number (6274990279).

Almost surely, 2^12549980557 is an apocalyptic number.

It is an amenable number.

12549980557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12549980557 is an equidigital number, since it uses as much as digits as its factorization.

12549980557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 12549980557 in words is "twelve billion, five hundred forty-nine million, nine hundred eighty thousand, five hundred fifty-seven".