66125615243 has 2 divisors, whose sum is σ = 66125615244. Its totient is φ = 66125615242.

The previous prime is 66125615159. The next prime is 66125615263. The reversal of 66125615243 is 34251652166.

It is a happy number.

66125615243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66125615243 - 2²⁰ = 66124566667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66125615243.

It is not a weakly prime, because it can be changed into another prime (66125615263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33062807621 + 33062807622.

It is an arithmetic number, because the mean of its divisors is an integer number (33062807622).

Almost surely, 2^66125615243 is an apocalyptic number.

66125615243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66125615243 is an equidigital number, since it uses as much as digits as its factorization.

66125615243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The spelling of 66125615243 in words is "sixty-six billion, one hundred twenty-five million, six hundred fifteen thousand, two hundred forty-three".