166091471 has 16 divisors (see below), whose sum is σ = 207778368. Its totient is φ = 129254400.

The previous prime is 166091449. The next prime is 166091473. The reversal of 166091471 is 174190661.

It is a cyclic number.

It is not a de Polignac number, because 166091471 - 2¹⁴ = 166075087 is a prime.

It is a super-3 number, since 3×166091471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166091473) 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 in 15 ways as a sum of consecutive naturals, for example, 9410 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (12986148).

Almost surely, 2^166091471 is an apocalyptic number.

166091471 is a deficient number, since it is larger than the sum of its proper divisors (41686897).

166091471 is a wasteful number, since it uses less digits than its factorization.

166091471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30002.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 166091471 is about 12887.6480010900. The cubic root of 166091471 is about 549.6873937059.

The spelling of 166091471 in words is "one hundred sixty-six million, ninety-one thousand, four hundred seventy-one".