66665580283806 has 16 divisors (see below), whose sum is σ = 152378469220224. Its totient is φ = 19047308652504.

The previous prime is 66665580283787. The next prime is 66665580283891. The reversal of 66665580283806 is 60838208556666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793637860480 + ... + 793637860563.

It is an arithmetic number, because the mean of its divisors is an integer number (9523654326264).

Almost surely, 2^{66665580283806} is an apocalyptic number.

66665580283806 is an abundant number, since it is smaller than the sum of its proper divisors (85712888936418).

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

66665580283806 is a wasteful number, since it uses less digits than its factorization.

66665580283806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587275721055.

The product of its (nonzero) digits is 597196800, while the sum is 69.

The spelling of 66665580283806 in words is "sixty-six trillion, six hundred sixty-five billion, five hundred eighty million, two hundred eighty-three thousand, eight hundred six".