171270221857 has 8 divisors (see below), whose sum is σ = 206039364800. Its totient is φ = 139076571024.

The previous prime is 171270221839. The next prime is 171270221869. The reversal of 171270221857 is 758122072171.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171270221857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171270221957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643872882 + ... + 643873147.

It is an arithmetic number, because the mean of its divisors is an integer number (25754920600).

Almost surely, 2^171270221857 is an apocalyptic number.

It is an amenable number.

171270221857 is a deficient number, since it is larger than the sum of its proper divisors (34769142943).

171270221857 is a wasteful number, since it uses less digits than its factorization.

171270221857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287746055.

The product of its (nonzero) digits is 109760, while the sum is 43.

The spelling of 171270221857 in words is "one hundred seventy-one billion, two hundred seventy million, two hundred twenty-one thousand, eight hundred fifty-seven".