166172671 has 12 divisors (see below), whose sum is σ = 204674688. Its totient is φ = 134054592.

The previous prime is 166172627. The next prime is 166172711. The reversal of 166172671 is 176271661.

It is not a de Polignac number, because 166172671 - 2¹⁵ = 166139903 is a prime.

It is a super-2 number, since 2×166172671² = 55226713174548482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166172671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166172621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98911 + ... + 100576.

It is an arithmetic number, because the mean of its divisors is an integer number (17056224).

Almost surely, 2^166172671 is an apocalyptic number.

166172671 is a deficient number, since it is larger than the sum of its proper divisors (38502017).

166172671 is a wasteful number, since it uses less digits than its factorization.

166172671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199518 (or 199511 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 166172671 is about 12890.7979194463. The cubic root of 166172671 is about 549.7769574953.

The spelling of 166172671 in words is "one hundred sixty-six million, one hundred seventy-two thousand, six hundred seventy-one".