66789080640 has 84 divisors (see below), whose sum is σ = 229726618524. Its totient is φ = 17810420736.

The previous prime is 66789080639. The next prime is 66789080653. The reversal of 66789080640 is 4608098766.

66789080640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12358324224 + 54430756416 = 111168^2 + 233304^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11592447 + ... + 11598206.

Almost surely, 2^66789080640 is an apocalyptic number.

66789080640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66789080640 is an abundant number, since it is smaller than the sum of its proper divisors (162937537884).

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

66789080640 is a wasteful number, since it uses less digits than its factorization.

66789080640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23190676 (or 23190663 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 66789080640 in words is "sixty-six billion, seven hundred eighty-nine million, eighty thousand, six hundred forty".