171222719959 has 2 divisors, whose sum is σ = 171222719960. Its totient is φ = 171222719958.

The previous prime is 171222719929. The next prime is 171222720013. The reversal of 171222719959 is 959917222171.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171222719959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171222719929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85611359979 + 85611359980.

It is an arithmetic number, because the mean of its divisors is an integer number (85611359980).

Almost surely, 2^171222719959 is an apocalyptic number.

171222719959 is a deficient number, since it is larger than the sum of its proper divisors (1).

171222719959 is an equidigital number, since it uses as much as digits as its factorization.

171222719959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 55.

The spelling of 171222719959 in words is "one hundred seventy-one billion, two hundred twenty-two million, seven hundred nineteen thousand, nine hundred fifty-nine".