166173523 has 2 divisors, whose sum is σ = 166173524. Its totient is φ = 166173522.

The previous prime is 166173499. The next prime is 166173541. The reversal of 166173523 is 325371661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166173523 is a prime.

It is a super-2 number, since 2×166173523² = 55227279492463058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166173223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83086761 + 83086762.

It is an arithmetic number, because the mean of its divisors is an integer number (83086762).

Almost surely, 2^166173523 is an apocalyptic number.

166173523 is a deficient number, since it is larger than the sum of its proper divisors (1).

166173523 is an equidigital number, since it uses as much as digits as its factorization.

166173523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 166173523 is about 12890.8309662333. The cubic root of 166173523 is about 549.7778970986. Note that the first 3 decimals are identical.

The spelling of 166173523 in words is "one hundred sixty-six million, one hundred seventy-three thousand, five hundred twenty-three".