16642664563 has 16 divisors (see below), whose sum is σ = 19136266240. Its totient is φ = 14178175200.

The previous prime is 16642664561. The next prime is 16642664627. The reversal of 16642664563 is 36546624661.

It is not a de Polignac number, because 16642664563 - 2¹ = 16642664561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16642664561) 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, 3442558 + ... + 3447388.

It is an arithmetic number, because the mean of its divisors is an integer number (1196016640).

Almost surely, 2^16642664563 is an apocalyptic number.

16642664563 is a deficient number, since it is larger than the sum of its proper divisors (2493601677).

16642664563 is a wasteful number, since it uses less digits than its factorization.

16642664563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738.

The product of its digits is 3732480, while the sum is 49.

The spelling of 16642664563 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-four thousand, five hundred sixty-three".