166138471 has 2 divisors, whose sum is σ = 166138472. Its totient is φ = 166138470.

The previous prime is 166138463. The next prime is 166138481. The reversal of 166138471 is 174831661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166138471 - 2³ = 166138463 is a prime.

It is a super-3 number, since 3×166138471³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166138471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166138481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83069235 + 83069236.

It is an arithmetic number, because the mean of its divisors is an integer number (83069236).

Almost surely, 2^166138471 is an apocalyptic number.

166138471 is a deficient number, since it is larger than the sum of its proper divisors (1).

166138471 is an equidigital number, since it uses as much as digits as its factorization.

166138471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 166138471 is about 12889.4713235260. The cubic root of 166138471 is about 549.7392383728.

The spelling of 166138471 in words is "one hundred sixty-six million, one hundred thirty-eight thousand, four hundred seventy-one".