171125722447 has 2 divisors, whose sum is σ = 171125722448. Its totient is φ = 171125722446.

The previous prime is 171125722381. The next prime is 171125722457. The reversal of 171125722447 is 744227521171.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171125722447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171125722457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85562861223 + 85562861224.

It is an arithmetic number, because the mean of its divisors is an integer number (85562861224).

Almost surely, 2^171125722447 is an apocalyptic number.

171125722447 is a deficient number, since it is larger than the sum of its proper divisors (1).

171125722447 is an equidigital number, since it uses as much as digits as its factorization.

171125722447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 43.

The spelling of 171125722447 in words is "one hundred seventy-one billion, one hundred twenty-five million, seven hundred twenty-two thousand, four hundred forty-seven".