66556744 has 32 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 32693760.

The previous prime is 66556741. The next prime is 66556757. The reversal of 66556744 is 44765566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66556744.

It is not an unprimeable number, because it can be changed into a prime (66556741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154209 + ... + 154639.

It is an arithmetic number, because the mean of its divisors is an integer number (3969000).

Almost surely, 2^66556744 is an apocalyptic number.

It is an amenable number.

66556744 is a deficient number, since it is larger than the sum of its proper divisors (60451256).

66556744 is a wasteful number, since it uses less digits than its factorization.

66556744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 729 counting only the distinct ones).

The product of its digits is 604800, while the sum is 43.

The square root of 66556744 is about 8158.2316711405. The cubic root of 66556744 is about 405.2571531530.

The spelling of 66556744 in words is "sixty-six million, five hundred fifty-six thousand, seven hundred forty-four".