172106998709 has 2 divisors, whose sum is σ = 172106998710. Its totient is φ = 172106998708.

The previous prime is 172106998703. The next prime is 172106998769. The reversal of 172106998709 is 907899601271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156303994609 + 15803004100 = 395353^2 + 125710^2 .

It is a cyclic number.

It is not a de Polignac number, because 172106998709 - 2²⁴ = 172090221493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172106998703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86053499354 + 86053499355.

It is an arithmetic number, because the mean of its divisors is an integer number (86053499355).

Almost surely, 2^172106998709 is an apocalyptic number.

It is an amenable number.

172106998709 is a deficient number, since it is larger than the sum of its proper divisors (1).

172106998709 is an equidigital number, since it uses as much as digits as its factorization.

172106998709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 59.

The spelling of 172106998709 in words is "one hundred seventy-two billion, one hundred six million, nine hundred ninety-eight thousand, seven hundred nine".