172238885779 has 2 divisors, whose sum is σ = 172238885780. Its totient is φ = 172238885778.

The previous prime is 172238885713. The next prime is 172238885783. The reversal of 172238885779 is 977588832271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172238885779 - 2²¹ = 172236788627 is a prime.

It is not a weakly prime, because it can be changed into another prime (172238385779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86119442889 + 86119442890.

It is an arithmetic number, because the mean of its divisors is an integer number (86119442890).

Almost surely, 2^172238885779 is an apocalyptic number.

172238885779 is a deficient number, since it is larger than the sum of its proper divisors (1).

172238885779 is an equidigital number, since it uses as much as digits as its factorization.

172238885779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94832640, while the sum is 67.

The spelling of 172238885779 in words is "one hundred seventy-two billion, two hundred thirty-eight million, eight hundred eighty-five thousand, seven hundred seventy-nine".