166701851671 has 4 divisors (see below), whose sum is σ = 166799971000. Its totient is φ = 166603732344.

The previous prime is 166701851651. The next prime is 166701851747. The reversal of 166701851671 is 176158107661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166701851671 - 2¹⁵ = 166701818903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166701851651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49057116 + ... + 49060513.

It is an arithmetic number, because the mean of its divisors is an integer number (41699992750).

Almost surely, 2^166701851671 is an apocalyptic number.

166701851671 is a deficient number, since it is larger than the sum of its proper divisors (98119329).

166701851671 is an equidigital number, since it uses as much as digits as its factorization.

166701851671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98119328.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 166701851671 in words is "one hundred sixty-six billion, seven hundred one million, eight hundred fifty-one thousand, six hundred seventy-one".