66081016 has 8 divisors (see below), whose sum is σ = 123901920. Its totient is φ = 33040504.

The previous prime is 66081011. The next prime is 66081019. The reversal of 66081016 is 61018066.

66081016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66081011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130056 + ... + 4130071.

It is an arithmetic number, because the mean of its divisors is an integer number (15487740).

Almost surely, 2^66081016 is an apocalyptic number.

It is an amenable number.

66081016 is a deficient number, since it is larger than the sum of its proper divisors (57820904).

66081016 is a wasteful number, since it uses less digits than its factorization.

66081016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8260133 (or 8260129 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 66081016 is about 8129.0230655350. The cubic root of 66081016 is about 404.2892905612.

The spelling of 66081016 in words is "sixty-six million, eighty-one thousand, sixteen".