66055984 has 20 divisors (see below), whose sum is σ = 128250720. Its totient is φ = 32959040.

The previous prime is 66055981. The next prime is 66055991. The reversal of 66055984 is 48955066.

It is a self number, because there is not a number n which added to its sum of digits gives 66055984.

It is not an unprimeable number, because it can be changed into a prime (66055981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4089 + ... + 12199.

It is an arithmetic number, because the mean of its divisors is an integer number (6412536).

Almost surely, 2^66055984 is an apocalyptic number.

It is an amenable number.

66055984 is a deficient number, since it is larger than the sum of its proper divisors (62194736).

66055984 is a wasteful number, since it uses less digits than its factorization.

66055984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8628 (or 8622 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 66055984 is about 8127.4832512900. The cubic root of 66055984 is about 404.2382348104.

It can be divided in two parts, 660 and 55984, that added together give a square (56644 = 238²).

The spelling of 66055984 in words is "sixty-six million, fifty-five thousand, nine hundred eighty-four".