12540176557 has 2 divisors, whose sum is σ = 12540176558. Its totient is φ = 12540176556.

The previous prime is 12540176543. The next prime is 12540176563. The reversal of 12540176557 is 75567104521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12023341801 + 516834756 = 109651^2 + 22734^2 .

It is a cyclic number.

It is not a de Polignac number, because 12540176557 - 2¹⁹ = 12539652269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12540176057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270088278 + 6270088279.

It is an arithmetic number, because the mean of its divisors is an integer number (6270088279).

Almost surely, 2^12540176557 is an apocalyptic number.

It is an amenable number.

12540176557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540176557 is an equidigital number, since it uses as much as digits as its factorization.

12540176557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 12540176557 in words is "twelve billion, five hundred forty million, one hundred seventy-six thousand, five hundred fifty-seven".