80666856512 has 112 divisors (see below), whose sum is σ = 179251660800. Its totient is φ = 35703360000.

The previous prime is 80666856499. The next prime is 80666856541. The reversal of 80666856512 is 21565866608.

It is a super-2 number, since 2×80666856512² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6578387 + ... + 6590637.

Almost surely, 2^80666856512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80666856512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89625830400).

80666856512 is an abundant number, since it is smaller than the sum of its proper divisors (98584804288).

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

80666856512 is a wasteful number, since it uses less digits than its factorization.

80666856512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12520 (or 12510 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 80666856512 in words is "eighty billion, six hundred sixty-six million, eight hundred fifty-six thousand, five hundred twelve".