66171834 has 12 divisors (see below), whose sum is σ = 143372346. Its totient is φ = 22057272.

The previous prime is 66171793. The next prime is 66171839. The reversal of 66171834 is 43817166.

66171834 is a `hidden beast` number, since 6 + 617 + 1 + 8 + 34 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 804609 = 8085^2 + 897^2 .

It is a super-2 number, since 2×66171834² = 8757423229847112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66171839) 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 5 ways as a sum of consecutive naturals, for example, 1838089 + ... + 1838124.

Almost surely, 2^66171834 is an apocalyptic number.

66171834 is an abundant number, since it is smaller than the sum of its proper divisors (77200512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66171834 is a wasteful number, since it uses less digits than its factorization.

66171834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676221 (or 3676218 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 66171834 is about 8134.6071816653. The cubic root of 66171834 is about 404.4744165341.

The spelling of 66171834 in words is "sixty-six million, one hundred seventy-one thousand, eight hundred thirty-four".