66081244896740 has 12 divisors (see below), whose sum is σ = 138770614283196. Its totient is φ = 26432497958688.

The previous prime is 66081244896703. The next prime is 66081244896803. The reversal of 66081244896740 is 4769844218066.

It can be written as a sum of positive squares in 2 ways, for example, as 18881267086564 + 47199977810176 = 4345258^2 + 6870224^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652031122399 + ... + 1652031122438.

It is an arithmetic number, because the mean of its divisors is an integer number (11564217856933).

Almost surely, 2^{66081244896740} is an apocalyptic number.

It is an amenable number.

66081244896740 is an abundant number, since it is smaller than the sum of its proper divisors (72689369386456).

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

66081244896740 is a wasteful number, since it uses less digits than its factorization.

66081244896740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304062244846 (or 3304062244844 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 65.

The spelling of 66081244896740 in words is "sixty-six trillion, eighty-one billion, two hundred forty-four million, eight hundred ninety-six thousand, seven hundred forty".