66671684 has 24 divisors (see below), whose sum is σ = 123298560. Its totient is φ = 31457376.

The previous prime is 66671681. The next prime is 66671701. The reversal of 66671684 is 48617666.

66671684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66671684² = 8890226894791712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66671681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19469 + ... + 22635.

It is an arithmetic number, because the mean of its divisors is an integer number (5137440).

Almost surely, 2^66671684 is an apocalyptic number.

It is an amenable number.

66671684 is a deficient number, since it is larger than the sum of its proper divisors (56626876).

66671684 is a wasteful number, since it uses less digits than its factorization.

66671684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467 (or 3465 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 66671684 is about 8165.2730511600. The cubic root of 66671684 is about 405.4903049280.

The spelling of 66671684 in words is "sixty-six million, six hundred seventy-one thousand, six hundred eighty-four".