171888206208541 has 2 divisors, whose sum is σ = 171888206208542. Its totient is φ = 171888206208540.

The previous prime is 171888206208533. The next prime is 171888206208559. The reversal of 171888206208541 is 145802602888171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116411778146041 + 55476428062500 = 10789429^2 + 7448250^2 .

It is an emirp because it is prime and its reverse (145802602888171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171888206208541 - 2³ = 171888206208533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171888206208541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171888206203541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85944103104270 + 85944103104271.

It is an arithmetic number, because the mean of its divisors is an integer number (85944103104271).

Almost surely, 2^{171888206208541} is an apocalyptic number.

It is an amenable number.

171888206208541 is a deficient number, since it is larger than the sum of its proper divisors (1).

171888206208541 is an equidigital number, since it uses as much as digits as its factorization.

171888206208541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13762560, while the sum is 61.

The spelling of 171888206208541 in words is "one hundred seventy-one trillion, eight hundred eighty-eight billion, two hundred six million, two hundred eight thousand, five hundred forty-one".