66580055008566 has 16 divisors (see below), whose sum is σ = 145265574564288. Its totient is φ = 20175774245000.

The previous prime is 66580055008553. The next prime is 66580055008603.

66580055008566 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, 504394356060 + ... + 504394356191.

It is an arithmetic number, because the mean of its divisors is an integer number (9079098410268).

Almost surely, 2^{66580055008566} is an apocalyptic number.

66580055008566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66580055008566 is an abundant number, since it is smaller than the sum of its proper divisors (78685519555722).

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

66580055008566 is a wasteful number, since it uses less digits than its factorization.

66580055008566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008788712267.

The product of its (nonzero) digits is 51840000, while the sum is 60.

The spelling of 66580055008566 in words is "sixty-six trillion, five hundred eighty billion, fifty-five million, eight thousand, five hundred sixty-six".