66422220640 has 24 divisors (see below), whose sum is σ = 156922496640. Its totient is φ = 26568888192.

The previous prime is 66422220583. The next prime is 66422220647. The reversal of 66422220640 is 4602222466.

It is a super-2 number, since 2×66422220640² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66422220596 and 66422220605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66422220647) 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 3 ways as a sum of consecutive naturals, for example, 207569280 + ... + 207569599.

It is an arithmetic number, because the mean of its divisors is an integer number (6538437360).

Almost surely, 2^66422220640 is an apocalyptic number.

It is an amenable number.

66422220640 is an abundant number, since it is smaller than the sum of its proper divisors (90500276000).

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

66422220640 is a wasteful number, since it uses less digits than its factorization.

66422220640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415138894 (or 415138886 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 66422220640 in words is "sixty-six billion, four hundred twenty-two million, two hundred twenty thousand, six hundred forty".