171665255479 has 2 divisors, whose sum is σ = 171665255480. Its totient is φ = 171665255478.

The previous prime is 171665255467. The next prime is 171665255483. The reversal of 171665255479 is 974552566171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171665255479 - 2²¹ = 171663158327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171665256479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85832627739 + 85832627740.

It is an arithmetic number, because the mean of its divisors is an integer number (85832627740).

Almost surely, 2^171665255479 is an apocalyptic number.

171665255479 is a deficient number, since it is larger than the sum of its proper divisors (1).

171665255479 is an equidigital number, since it uses as much as digits as its factorization.

171665255479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876000, while the sum is 58.

The spelling of 171665255479 in words is "one hundred seventy-one billion, six hundred sixty-five million, two hundred fifty-five thousand, four hundred seventy-nine".