66651020 has 12 divisors (see below), whose sum is σ = 139967184. Its totient is φ = 26660400.

The previous prime is 66651017. The next prime is 66651041. The reversal of 66651020 is 2015666.

66651020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1666256 + ... + 1666295.

It is an arithmetic number, because the mean of its divisors is an integer number (11663932).

Almost surely, 2^66651020 is an apocalyptic number.

It is an amenable number.

66651020 is an abundant number, since it is smaller than the sum of its proper divisors (73316164).

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

66651020 is a wasteful number, since it uses less digits than its factorization.

66651020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332560 (or 3332558 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66651020 is about 8164.0075943130. The cubic root of 66651020 is about 405.4484084938.

Adding to 66651020 its reverse (2015666), we get a palindrome (68666686).

The spelling of 66651020 in words is "sixty-six million, six hundred fifty-one thousand, twenty".