66654628 has 6 divisors (see below), whose sum is σ = 116645606. Its totient is φ = 33327312.

The previous prime is 66654611. The next prime is 66654629. The reversal of 66654628 is 82645666.

66654628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 65804544 + 850084 = 8112^2 + 922^2 .

It is not an unprimeable number, because it can be changed into a prime (66654629) 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 as a sum of consecutive naturals, namely, 8331825 + ... + 8331832.

Almost surely, 2^66654628 is an apocalyptic number.

It is an amenable number.

66654628 is a deficient number, since it is larger than the sum of its proper divisors (49990978).

66654628 is a wasteful number, since it uses less digits than its factorization.

66654628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16663661 (or 16663659 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 66654628 is about 8164.2285612298. The cubic root of 66654628 is about 405.4557243681.

The spelling of 66654628 in words is "sixty-six million, six hundred fifty-four thousand, six hundred twenty-eight".