66220628488 has 32 divisors (see below), whose sum is σ = 145201383360. Its totient is φ = 27720262080.

The previous prime is 66220628471. The next prime is 66220628491. The reversal of 66220628488 is 88482602266.

It is a super-2 number, since 2×66220628488² (a number of 22 digits) contains 22 as substring.

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, 13747723 + ... + 13752538.

It is an arithmetic number, because the mean of its divisors is an integer number (4537543230).

Almost surely, 2^66220628488 is an apocalyptic number.

It is an amenable number.

66220628488 is an abundant number, since it is smaller than the sum of its proper divisors (78980754872).

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

66220628488 is a wasteful number, since it uses less digits than its factorization.

66220628488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27500317 (or 27500313 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 52.

The spelling of 66220628488 in words is "sixty-six billion, two hundred twenty million, six hundred twenty-eight thousand, four hundred eighty-eight".