16642663073 has 2 divisors, whose sum is σ = 16642663074. Its totient is φ = 16642663072.

The previous prime is 16642663067. The next prime is 16642663153. The reversal of 16642663073 is 37036624661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15278690449 + 1363972624 = 123607^2 + 36932^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642663073 - 2²⁰ = 16641614497 is a prime.

It is a super-2 number, since 2×16642663073² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16642663003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321331536 + 8321331537.

It is an arithmetic number, because the mean of its divisors is an integer number (8321331537).

Almost surely, 2^16642663073 is an apocalyptic number.

It is an amenable number.

16642663073 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642663073 is an equidigital number, since it uses as much as digits as its factorization.

16642663073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 16642663073 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-three thousand, seventy-three".