66556516 has 24 divisors (see below), whose sum is σ = 125922944. Its totient is φ = 30598560.

The previous prime is 66556507. The next prime is 66556519. The reversal of 66556516 is 61565566.

It is not an unprimeable number, because it can be changed into a prime (66556519) 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, 11731 + ... + 16453.

Almost surely, 2^66556516 is an apocalyptic number.

It is an amenable number.

66556516 is a deficient number, since it is larger than the sum of its proper divisors (59366428).

66556516 is a wasteful number, since it uses less digits than its factorization.

66556516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5009 counting only the distinct ones).

The product of its digits is 162000, while the sum is 40.

The square root of 66556516 is about 8158.2176975121. The cubic root of 66556516 is about 405.2566903964.

The spelling of 66556516 in words is "sixty-six million, five hundred fifty-six thousand, five hundred sixteen".