66516884 has 12 divisors (see below), whose sum is σ = 133033824. Its totient is φ = 28507224.

The previous prime is 66516839. The next prime is 66516889. The reversal of 66516884 is 48861566.

66516884 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66516889) 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, 1187774 + ... + 1187829.

It is an arithmetic number, because the mean of its divisors is an integer number (11086152).

Almost surely, 2^66516884 is an apocalyptic number.

It is an amenable number.

66516884 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66516884 is a wasteful number, since it uses less digits than its factorization.

66516884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375614 (or 2375612 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 66516884 is about 8155.7883739097. The cubic root of 66516884 is about 405.1762358538.

The spelling of 66516884 in words is "sixty-six million, five hundred sixteen thousand, eight hundred eighty-four".