9999616973 has 2 divisors, whose sum is σ = 9999616974. Its totient is φ = 9999616972.

The previous prime is 9999616931. The next prime is 9999616981. The reversal of 9999616973 is 3796169999.

It is a happy number.

9999616973 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9275038249 + 724578724 = 96307^2 + 26918^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999616973 - 2⁸ = 9999616717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999616673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999808486 + 4999808487.

It is an arithmetic number, because the mean of its divisors is an integer number (4999808487).

Almost surely, 2^9999616973 is an apocalyptic number.

It is an amenable number.

9999616973 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999616973 is an equidigital number, since it uses as much as digits as its factorization.

9999616973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44641044, while the sum is 68.

The square root of 9999616973 is about 99998.0848466609. The cubic root of 9999616973 is about 2154.4071827921.

The spelling of 9999616973 in words is "nine billion, nine hundred ninety-nine million, six hundred sixteen thousand, nine hundred seventy-three".