66840804100 has 72 divisors (see below), whose sum is σ = 165847385088. Its totient is φ = 22905484800.

The previous prime is 66840804073. The next prime is 66840804109. The reversal of 66840804100 is 140804866.

It is a self number, because there is not a number n which added to its sum of digits gives 66840804100.

It is not an unprimeable number, because it can be changed into a prime (66840804109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1455084 + ... + 1500316.

It is an arithmetic number, because the mean of its divisors is an integer number (2303435904).

Almost surely, 2^66840804100 is an apocalyptic number.

It is an amenable number.

66840804100 is an abundant number, since it is smaller than the sum of its proper divisors (99006580988).

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

66840804100 is a wasteful number, since it uses less digits than its factorization.

66840804100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47365 (or 47358 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 66840804100 in words is "sixty-six billion, eight hundred forty million, eight hundred four thousand, one hundred".