66621652 has 12 divisors (see below), whose sum is σ = 117240480. Its totient is φ = 33124376.

The previous prime is 66621649. The next prime is 66621661. The reversal of 66621652 is 25612666.

66621652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 45808 + ... + 47239.

It is an arithmetic number, because the mean of its divisors is an integer number (9770040).

Almost surely, 2^66621652 is an apocalyptic number.

It is an amenable number.

66621652 is a deficient number, since it is larger than the sum of its proper divisors (50618828).

66621652 is a wasteful number, since it uses less digits than its factorization.

66621652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93230 (or 93228 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 66621652 is about 8162.2087696897. The cubic root of 66621652 is about 405.3888497246.

The spelling of 66621652 in words is "sixty-six million, six hundred twenty-one thousand, six hundred fifty-two".