172806128711 has 2 divisors, whose sum is σ = 172806128712. Its totient is φ = 172806128710.

The previous prime is 172806128659. The next prime is 172806128741. The reversal of 172806128711 is 117821608271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172806128711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172806128741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86403064355 + 86403064356.

It is an arithmetic number, because the mean of its divisors is an integer number (86403064356).

Almost surely, 2^172806128711 is an apocalyptic number.

172806128711 is a deficient number, since it is larger than the sum of its proper divisors (1).

172806128711 is an equidigital number, since it uses as much as digits as its factorization.

172806128711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 44.

The spelling of 172806128711 in words is "one hundred seventy-two billion, eight hundred six million, one hundred twenty-eight thousand, seven hundred eleven".