171660736561 has 8 divisors (see below), whose sum is σ = 173028142080. Its totient is φ = 170293577328.

The previous prime is 171660736537. The next prime is 171660736607. The reversal of 171660736561 is 165637066171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171660736561 - 2⁵ = 171660736529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171660737561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493610 + ... + 1604428.

It is an arithmetic number, because the mean of its divisors is an integer number (21628517760).

Almost surely, 2^171660736561 is an apocalyptic number.

It is an amenable number.

171660736561 is a deficient number, since it is larger than the sum of its proper divisors (1367405519).

171660736561 is a wasteful number, since it uses less digits than its factorization.

171660736561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123143.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 171660736561 in words is "one hundred seventy-one billion, six hundred sixty million, seven hundred thirty-six thousand, five hundred sixty-one".