171145542761 has 2 divisors, whose sum is σ = 171145542762. Its totient is φ = 171145542760.

The previous prime is 171145542721. The next prime is 171145542779. The reversal of 171145542761 is 167245541171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109508046400 + 61637496361 = 330920^2 + 248269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171145542761 is a prime.

It is not a weakly prime, because it can be changed into another prime (171145542721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85572771380 + 85572771381.

It is an arithmetic number, because the mean of its divisors is an integer number (85572771381).

Almost surely, 2^171145542761 is an apocalyptic number.

It is an amenable number.

171145542761 is a deficient number, since it is larger than the sum of its proper divisors (1).

171145542761 is an equidigital number, since it uses as much as digits as its factorization.

171145542761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235200, while the sum is 44.

The spelling of 171145542761 in words is "one hundred seventy-one billion, one hundred forty-five million, five hundred forty-two thousand, seven hundred sixty-one".