66771040444 has 12 divisors (see below), whose sum is σ = 116875428768. Its totient is φ = 33378060800.

The previous prime is 66771040421. The next prime is 66771040447. The reversal of 66771040444 is 44404017766.

It is a self number, because there is not a number n which added to its sum of digits gives 66771040444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66771040447) 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, 1844692 + ... + 1880539.

It is an arithmetic number, because the mean of its divisors is an integer number (9739619064).

Almost surely, 2^66771040444 is an apocalyptic number.

It is an amenable number.

66771040444 is a deficient number, since it is larger than the sum of its proper divisors (50104388324).

66771040444 is a wasteful number, since it uses less digits than its factorization.

66771040444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729716 (or 3729714 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 66771040444 in words is "sixty-six billion, seven hundred seventy-one million, forty thousand, four hundred forty-four".