12558457167561 has 20 divisors (see below), whose sum is σ = 18765314498832. Its totient is φ = 8370006392088.

The previous prime is 12558457167497. The next prime is 12558457167589. The reversal of 12558457167561 is 16576175485521.

12558457167561 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 8 + 4 + 5 + 7 + 1 + 67 + 561 = 666.

It is not a de Polignac number, because 12558457167561 - 2⁶ = 12558457167497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12558457168561) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20984451 + ... + 21574616.

Almost surely, 2^{12558457167561} is an apocalyptic number.

It is an amenable number.

12558457167561 is a deficient number, since it is larger than the sum of its proper divisors (6206857331271).

12558457167561 is an equidigital number, since it uses as much as digits as its factorization.

12558457167561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42562722 (or 42562713 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 63.

The spelling of 12558457167561 in words is "twelve trillion, five hundred fifty-eight billion, four hundred fifty-seven million, one hundred sixty-seven thousand, five hundred sixty-one".