166617271 has 4 divisors (see below), whose sum is σ = 168624792. Its totient is φ = 164609752.

The previous prime is 166617263. The next prime is 166617287. The reversal of 166617271 is 172716661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172716661 = 13 ⋅13285897.

It is a cyclic number.

It is not a de Polignac number, because 166617271 - 2³ = 166617263 is a prime.

It is a super-2 number, since 2×166617271² = 55522629990974882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166617271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166617211) 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, 1003636 + ... + 1003801.

It is an arithmetic number, because the mean of its divisors is an integer number (42156198).

Almost surely, 2^166617271 is an apocalyptic number.

166617271 is a deficient number, since it is larger than the sum of its proper divisors (2007521).

166617271 is an equidigital number, since it uses as much as digits as its factorization.

166617271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007520.

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

The square root of 166617271 is about 12908.0312596461. The cubic root of 166617271 is about 550.2668358113.

It can be divided in two parts, 16661 and 7271, that added together give a palindrome (23932).

The spelling of 166617271 in words is "one hundred sixty-six million, six hundred seventeen thousand, two hundred seventy-one".