66220353563 has 48 divisors (see below), whose sum is σ = 84886068960. Its totient is φ = 51189594624.

The previous prime is 66220353557. The next prime is 66220353583. The reversal of 66220353563 is 36535302266.

It is a happy number.

66220353563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66220353563 - 2⁶ = 66220353499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66220353563.

It is not an unprimeable number, because it can be changed into a prime (66220353523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4968953 + ... + 4982261.

It is an arithmetic number, because the mean of its divisors is an integer number (1768459770).

Almost surely, 2^66220353563 is an apocalyptic number.

66220353563 is a deficient number, since it is larger than the sum of its proper divisors (18665715397).

66220353563 is a wasteful number, since it uses less digits than its factorization.

66220353563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13516 (or 13509 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 41.

The spelling of 66220353563 in words is "sixty-six billion, two hundred twenty million, three hundred fifty-three thousand, five hundred sixty-three".