66385777758366 has 16 divisors (see below), whose sum is σ = 144841696927488. Its totient is φ = 20116902351000.

The previous prime is 66385777758343. The next prime is 66385777758427.

It is a happy number.

66385777758366 is nontrivially palindromic in base 10.

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, 502922558710 + ... + 502922558841.

It is an arithmetic number, because the mean of its divisors is an integer number (9052606057968).

Almost surely, 2^{66385777758366} is an apocalyptic number.

66385777758366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66385777758366 is an abundant number, since it is smaller than the sum of its proper divisors (78455919169122).

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

66385777758366 is a wasteful number, since it uses less digits than its factorization.

66385777758366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005845117567.

The product of its digits is 44808422400, while the sum is 84.

The spelling of 66385777758366 in words is "sixty-six trillion, three hundred eighty-five billion, seven hundred seventy-seven million, seven hundred fifty-eight thousand, three hundred sixty-six".