66220563 has 16 divisors (see below), whose sum is σ = 90989216. Its totient is φ = 42819840.

The previous prime is 66220547. The next prime is 66220607. The reversal of 66220563 is 36502266.

It is not a de Polignac number, because 66220563 - 2⁴ = 66220547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66220563.

It is not an unprimeable number, because it can be changed into a prime (66220523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10881 + ... + 15837.

It is an arithmetic number, because the mean of its divisors is an integer number (5686826).

Almost surely, 2^66220563 is an apocalyptic number.

66220563 is a deficient number, since it is larger than the sum of its proper divisors (24768653).

66220563 is a wasteful number, since it uses less digits than its factorization.

66220563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66220563 is about 8137.6017965983. The cubic root of 66220563 is about 404.5736772849.

The spelling of 66220563 in words is "sixty-six million, two hundred twenty thousand, five hundred sixty-three".