126555346642217 has 4 divisors (see below), whose sum is σ = 126930881795796. Its totient is φ = 126179811488640.

The previous prime is 126555346642177. The next prime is 126555346642271. The reversal of 126555346642217 is 712246643555621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60423011354176 + 66132335288041 = 7773224^2 + 8132179^2 .

It is a cyclic number.

It is not a de Polignac number, because 126555346642217 - 2⁸ = 126555346641961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126555346642717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187767576284 + ... + 187767576957.

It is an arithmetic number, because the mean of its divisors is an integer number (31732720448949).

Almost surely, 2^{126555346642217} is an apocalyptic number.

It is an amenable number.

126555346642217 is a deficient number, since it is larger than the sum of its proper divisors (375535153579).

126555346642217 is an equidigital number, since it uses as much as digits as its factorization.

126555346642217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375535153578.

The product of its digits is 72576000, while the sum is 59.

The spelling of 126555346642217 in words is "one hundred twenty-six trillion, five hundred fifty-five billion, three hundred forty-six million, six hundred forty-two thousand, two hundred seventeen".