66172755239 has 2 divisors, whose sum is σ = 66172755240. Its totient is φ = 66172755238.

The previous prime is 66172755223. The next prime is 66172755251. The reversal of 66172755239 is 93255727166.

It is a happy number.

66172755239 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 66172755239 - 2⁴ = 66172755223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66172755269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086377619 + 33086377620.

It is an arithmetic number, because the mean of its divisors is an integer number (33086377620).

Almost surely, 2^66172755239 is an apocalyptic number.

66172755239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66172755239 is an equidigital number, since it uses as much as digits as its factorization.

66172755239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 53.

The spelling of 66172755239 in words is "sixty-six billion, one hundred seventy-two million, seven hundred fifty-five thousand, two hundred thirty-nine".