166121271 has 12 divisors (see below), whose sum is σ = 240584448. Its totient is φ = 110456064.

The previous prime is 166121261. The next prime is 166121321. The reversal of 166121271 is 172121661.

It is a happy number.

It is not a de Polignac number, because 166121271 - 2¹⁷ = 165990199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166121261) 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, 20650 + ... + 27543.

It is an arithmetic number, because the mean of its divisors is an integer number (20048704).

Almost surely, 2^166121271 is an apocalyptic number.

166121271 is a deficient number, since it is larger than the sum of its proper divisors (74463177).

166121271 is a wasteful number, since it uses less digits than its factorization.

166121271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48582 (or 48579 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 166121271 is about 12888.8040950276. The cubic root of 166121271 is about 549.7202665654.

The spelling of 166121271 in words is "one hundred sixty-six million, one hundred twenty-one thousand, two hundred seventy-one".