171853257206216 has 8 divisors (see below), whose sum is σ = 322224857261670. Its totient is φ = 85926628603104.

The previous prime is 171853257206207. The next prime is 171853257206219. The reversal of 171853257206216 is 612602752358171.

It can be written as a sum of positive squares in only one way, i.e., 157154053932100 + 14699203274116 = 12536110^2 + 3833954^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (171853257206219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740828575381 + ... + 10740828575396.

Almost surely, 2^{171853257206216} is an apocalyptic number.

It is an amenable number.

171853257206216 is a deficient number, since it is larger than the sum of its proper divisors (150371600055454).

171853257206216 is a wasteful number, since it uses less digits than its factorization.

171853257206216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21481657150783 (or 21481657150779 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 171853257206216 in words is "one hundred seventy-one trillion, eight hundred fifty-three billion, two hundred fifty-seven million, two hundred six thousand, two hundred sixteen".