66620233872 has 60 divisors (see below), whose sum is σ = 187390623420. Its totient is φ = 22094010624.

The previous prime is 66620233871. The next prime is 66620233877. The reversal of 66620233872 is 27833202666.

It can be written as a sum of positive squares in 2 ways, for example, as 64426622976 + 2193610896 = 253824^2 + 46836^2 .

It is a super-2 number, since 2×66620233872² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66620233871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1145847 + ... + 1202582.

It is an arithmetic number, because the mean of its divisors is an integer number (3123177057).

Almost surely, 2^66620233872 is an apocalyptic number.

It is an amenable number.

66620233872 is an abundant number, since it is smaller than the sum of its proper divisors (120770389548).

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

66620233872 is a wasteful number, since it uses less digits than its factorization.

66620233872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348640 (or 2348631 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The spelling of 66620233872 in words is "sixty-six billion, six hundred twenty million, two hundred thirty-three thousand, eight hundred seventy-two".