166172673 has 4 divisors (see below), whose sum is σ = 221563568. Its totient is φ = 110781780.

The previous prime is 166172627. The next prime is 166172711. The reversal of 166172673 is 376271661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 376271661 = 3 ⋅125423887.

It is not a de Polignac number, because 166172673 - 2¹² = 166168577 is a prime.

It is a super-2 number, since 2×166172673² = 55226714503929858, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166172273) 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, 27695443 + ... + 27695448.

It is an arithmetic number, because the mean of its divisors is an integer number (55390892).

Almost surely, 2^166172673 is an apocalyptic number.

It is an amenable number.

166172673 is a deficient number, since it is larger than the sum of its proper divisors (55390895).

166172673 is an equidigital number, since it uses as much as digits as its factorization.

166172673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55390894.

The product of its digits is 63504, while the sum is 39.

The square root of 166172673 is about 12890.7979970210. The cubic root of 166172673 is about 549.7769597009.

The spelling of 166172673 in words is "one hundred sixty-six million, one hundred seventy-two thousand, six hundred seventy-three".