166172323 has 4 divisors (see below), whose sum is σ = 167100840. Its totient is φ = 165243808.

The previous prime is 166172317. The next prime is 166172389. The reversal of 166172323 is 323271661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323271661 = 499 ⋅647839.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166172323 is a prime.

It is a super-2 number, since 2×166172323² = 55226481862432658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166176323) 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, 463990 + ... + 464347.

It is an arithmetic number, because the mean of its divisors is an integer number (41775210).

Almost surely, 2^166172323 is an apocalyptic number.

166172323 is a deficient number, since it is larger than the sum of its proper divisors (928517).

166172323 is an equidigital number, since it uses as much as digits as its factorization.

166172323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928516.

The product of its digits is 9072, while the sum is 31.

The square root of 166172323 is about 12890.7844214384. The cubic root of 166172323 is about 549.7765737127.

It can be divided in two parts, 16617 and 2323, that multiplied together give a triangular number (38601291 = T₈₇₈₆).

The spelling of 166172323 in words is "one hundred sixty-six million, one hundred seventy-two thousand, three hundred twenty-three".