125645543381201 has 2 divisors, whose sum is σ = 125645543381202. Its totient is φ = 125645543381200.

The previous prime is 125645543381153. The next prime is 125645543381257. The reversal of 125645543381201 is 102183345546521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84461172956176 + 41184370425025 = 9190276^2 + 6417505^2 .

It is a cyclic number.

It is not a de Polignac number, because 125645543381201 - 2²² = 125645539186897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125645543381201.

It is not a weakly prime, because it can be changed into another prime (125645543381261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62822771690600 + 62822771690601.

It is an arithmetic number, because the mean of its divisors is an integer number (62822771690601).

Almost surely, 2^{125645543381201} is an apocalyptic number.

It is an amenable number.

125645543381201 is a deficient number, since it is larger than the sum of its proper divisors (1).

125645543381201 is an equidigital number, since it uses as much as digits as its factorization.

125645543381201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 125645543381201 in words is "one hundred twenty-five trillion, six hundred forty-five billion, five hundred forty-three million, three hundred eighty-one thousand, two hundred one".