66840804120 has 32 divisors (see below), whose sum is σ = 200522412720. Its totient is φ = 17824214400.

The previous prime is 66840804109. The next prime is 66840804127. The reversal of 66840804120 is 2140804866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66840804127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278503231 + ... + 278503470.

Almost surely, 2^66840804120 is an apocalyptic number.

66840804120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66840804120 is an abundant number, since it is smaller than the sum of its proper divisors (133681608600).

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

66840804120 is a wasteful number, since it uses less digits than its factorization.

66840804120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557006715 (or 557006711 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 66840804120 in words is "sixty-six billion, eight hundred forty million, eight hundred four thousand, one hundred twenty".