16642665073 has 2 divisors, whose sum is σ = 16642665074. Its totient is φ = 16642665072.

The previous prime is 16642665047. The next prime is 16642665107. The reversal of 16642665073 is 37056624661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15690819169 + 951845904 = 125263^2 + 30852^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642665073 - 2⁹ = 16642664561 is a prime.

It is not a weakly prime, because it can be changed into another prime (16642663073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321332536 + 8321332537.

It is an arithmetic number, because the mean of its divisors is an integer number (8321332537).

Almost surely, 2^16642665073 is an apocalyptic number.

It is an amenable number.

16642665073 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642665073 is an equidigital number, since it uses as much as digits as its factorization.

16642665073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 16642665073 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-five thousand, seventy-three".