66680413650 has 48 divisors (see below), whose sum is σ = 183741588000. Its totient is φ = 17781443280.

The previous prime is 66680413643. The next prime is 66680413663. The reversal of 66680413650 is 5631408666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66680413596 and 66680413605.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24695100 + ... + 24697799.

It is an arithmetic number, because the mean of its divisors is an integer number (3827949750).

Almost surely, 2^66680413650 is an apocalyptic number.

66680413650 is an abundant number, since it is smaller than the sum of its proper divisors (117061174350).

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

66680413650 is a wasteful number, since it uses less digits than its factorization.

66680413650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49392920 (or 49392909 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 66680413650 in words is "sixty-six billion, six hundred eighty million, four hundred thirteen thousand, six hundred fifty".