66680135620 has 24 divisors (see below), whose sum is σ = 160032325824. Its totient is φ = 22861760736.

The previous prime is 66680135591. The next prime is 66680135629. The reversal of 66680135620 is 2653108666.

It is not an unprimeable number, because it can be changed into a prime (66680135629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238143202 + ... + 238143481.

It is an arithmetic number, because the mean of its divisors is an integer number (6668013576).

Almost surely, 2^66680135620 is an apocalyptic number.

It is an amenable number.

66680135620 is an abundant number, since it is smaller than the sum of its proper divisors (93352190204).

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

66680135620 is a wasteful number, since it uses less digits than its factorization.

66680135620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476286699 (or 476286697 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 66680135620 in words is "sixty-six billion, six hundred eighty million, one hundred thirty-five thousand, six hundred twenty".