9999928647161 has 2 divisors, whose sum is σ = 9999928647162. Its totient is φ = 9999928647160.

The previous prime is 9999928647119. The next prime is 9999928647211. The reversal of 9999928647161 is 1617468299999.

9999928647161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9582120250000 + 417808397161 = 3095500^2 + 646381^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999928647161 - 2¹⁸ = 9999928385017 is a prime.

It is a super-2 number, since 2×9999928647161² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9999928647101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999964323580 + 4999964323581.

It is an arithmetic number, because the mean of its divisors is an integer number (4999964323581).

Almost surely, 2^{9999928647161} is an apocalyptic number.

It is an amenable number.

9999928647161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999928647161 is an equidigital number, since it uses as much as digits as its factorization.

9999928647161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952342272, while the sum is 80.

The spelling of 9999928647161 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred twenty-eight million, six hundred forty-seven thousand, one hundred sixty-one".