66684654 has 16 divisors (see below), whose sum is σ = 148188240. Its totient is φ = 22228200.

The previous prime is 66684649. The next prime is 66684707. The reversal of 66684654 is 45648666.

66684654 is nontrivially palindromic in base 14.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 617397 + ... + 617504.

It is an arithmetic number, because the mean of its divisors is an integer number (9261765).

Almost surely, 2^66684654 is an apocalyptic number.

66684654 is an abundant number, since it is smaller than the sum of its proper divisors (81503586).

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

66684654 is a wasteful number, since it uses less digits than its factorization.

66684654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234912 (or 1234906 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 66684654 is about 8166.0672297012. The cubic root of 66684654 is about 405.5165972905.

The spelling of 66684654 in words is "sixty-six million, six hundred eighty-four thousand, six hundred fifty-four".