172220656711 has 2 divisors, whose sum is σ = 172220656712. Its totient is φ = 172220656710.

The previous prime is 172220656703. The next prime is 172220656723. The reversal of 172220656711 is 117656022271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172220656711 - 2³ = 172220656703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172220656781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86110328355 + 86110328356.

It is an arithmetic number, because the mean of its divisors is an integer number (86110328356).

Almost surely, 2^172220656711 is an apocalyptic number.

172220656711 is a deficient number, since it is larger than the sum of its proper divisors (1).

172220656711 is an equidigital number, since it uses as much as digits as its factorization.

172220656711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

Adding to 172220656711 its reverse (117656022271), we get a palindrome (289876678982).

The spelling of 172220656711 in words is "one hundred seventy-two billion, two hundred twenty million, six hundred fifty-six thousand, seven hundred eleven".