66124665220 has 24 divisors (see below), whose sum is σ = 138912758208. Its totient is φ = 26440159200.

The previous prime is 66124665209. The next prime is 66124665239. The reversal of 66124665220 is 2256642166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550696 + ... + 659935.

It is an arithmetic number, because the mean of its divisors is an integer number (5788031592).

Almost surely, 2^66124665220 is an apocalyptic number.

It is an amenable number.

66124665220 is an abundant number, since it is smaller than the sum of its proper divisors (72788092988).

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

66124665220 is a wasteful number, since it uses less digits than its factorization.

66124665220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213371 (or 1213369 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 66124665220 in words is "sixty-six billion, one hundred twenty-four million, six hundred sixty-five thousand, two hundred twenty".