66820146680 has 32 divisors (see below), whose sum is σ = 171823235040. Its totient is φ = 22909764480.

The previous prime is 66820146619. The next prime is 66820146683. The reversal of 66820146680 is 8664102866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66820146683) 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, 119321411 + ... + 119321970.

It is an arithmetic number, because the mean of its divisors is an integer number (5369476095).

Almost surely, 2^66820146680 is an apocalyptic number.

It is an amenable number.

66820146680 is an abundant number, since it is smaller than the sum of its proper divisors (105003088360).

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

66820146680 is a wasteful number, since it uses less digits than its factorization.

66820146680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238643399 (or 238643395 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 66820146680 in words is "sixty-six billion, eight hundred twenty million, one hundred forty-six thousand, six hundred eighty".