66840644804 has 12 divisors (see below), whose sum is σ = 116975694528. Its totient is φ = 33419017800.

The previous prime is 66840644779. The next prime is 66840644881. The reversal of 66840644804 is 40844604866.

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, 205952 + ... + 419639.

It is an arithmetic number, because the mean of its divisors is an integer number (9747974544).

Almost surely, 2^66840644804 is an apocalyptic number.

It is an amenable number.

66840644804 is a deficient number, since it is larger than the sum of its proper divisors (50135049724).

66840644804 is a wasteful number, since it uses less digits than its factorization.

66840644804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652306 (or 652304 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 50.

The spelling of 66840644804 in words is "sixty-six billion, eight hundred forty million, six hundred forty-four thousand, eight hundred four".