66555016 has 48 divisors (see below), whose sum is σ = 140847120. Its totient is φ = 29239200.

The previous prime is 66554987. The next prime is 66555023. The reversal of 66555016 is 61055566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84175 + ... + 84961.

It is an arithmetic number, because the mean of its divisors is an integer number (2934315).

Almost surely, 2^66555016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66555016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70423560).

66555016 is an abundant number, since it is smaller than the sum of its proper divisors (74292104).

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

66555016 is a wasteful number, since it uses less digits than its factorization.

66555016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 66555016 is about 8158.1257651497. The cubic root of 66555016 is about 405.2536459181.

It can be divided in two parts, 665550 and 16, that added together give a palindrome (665566).

The spelling of 66555016 in words is "sixty-six million, five hundred fifty-five thousand, sixteen".