66665580283808 has 24 divisors (see below), whose sum is σ = 143179484928480. Its totient is φ = 30302536492480.

The previous prime is 66665580283787. The next prime is 66665580283891. The reversal of 66665580283808 is 80838208556666.

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, 94695426188 + ... + 94695426891.

It is an arithmetic number, because the mean of its divisors is an integer number (5965811872020).

Almost surely, 2^{66665580283808} is an apocalyptic number.

It is an amenable number.

66665580283808 is an abundant number, since it is smaller than the sum of its proper divisors (76513904644672).

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

66665580283808 is a wasteful number, since it uses less digits than its factorization.

66665580283808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189390853100 (or 189390853092 counting only the distinct ones).

The product of its (nonzero) digits is 796262400, while the sum is 71.

The spelling of 66665580283808 in words is "sixty-six trillion, six hundred sixty-five billion, five hundred eighty million, two hundred eighty-three thousand, eight hundred eight".