80661388888 has 8 divisors (see below), whose sum is σ = 151240104180. Its totient is φ = 40330694440.

The previous prime is 80661388859. The next prime is 80661388901. The reversal of 80661388888 is 88888316608.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5041336798 + ... + 5041336813.

Almost surely, 2^80661388888 is an apocalyptic number.

It is an amenable number.

80661388888 is a deficient number, since it is larger than the sum of its proper divisors (70578715292).

80661388888 is a wasteful number, since it uses less digits than its factorization.

80661388888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082673617 (or 10082673613 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 64.

The spelling of 80661388888 in words is "eighty billion, six hundred sixty-one million, three hundred eighty-eight thousand, eight hundred eighty-eight".