66068864 has 16 divisors (see below), whose sum is σ = 131621820. Its totient is φ = 33034368.

The previous prime is 66068839. The next prime is 66068881. The reversal of 66068864 is 46886066.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257954 + ... + 258209.

Almost surely, 2^66068864 is an apocalyptic number.

66068864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66068864 is a deficient number, since it is larger than the sum of its proper divisors (65552956).

66068864 is an equidigital number, since it uses as much as digits as its factorization.

66068864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516177 (or 516165 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 66068864 is about 8128.2755858792. The cubic root of 66068864 is about 404.2645067178.

The spelling of 66068864 in words is "sixty-six million, sixty-eight thousand, eight hundred sixty-four".