66220628487 has 32 divisors (see below), whose sum is σ = 96235776000. Its totient is φ = 40260163200.

The previous prime is 66220628471. The next prime is 66220628491. The reversal of 66220628487 is 78482602266.

It is a happy number.

It is not a de Polignac number, because 66220628487 - 2⁴ = 66220628471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220628497) 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 31 ways as a sum of consecutive naturals, for example, 1821514 + ... + 1857512.

It is an arithmetic number, because the mean of its divisors is an integer number (3007368000).

Almost surely, 2^66220628487 is an apocalyptic number.

66220628487 is a deficient number, since it is larger than the sum of its proper divisors (30015147513).

66220628487 is a wasteful number, since it uses less digits than its factorization.

66220628487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36583.

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 66220628487 in words is "sixty-six billion, two hundred twenty million, six hundred twenty-eight thousand, four hundred eighty-seven".