9998161708651 has 2 divisors, whose sum is σ = 9998161708652. Its totient is φ = 9998161708650.

The previous prime is 9998161708649. The next prime is 9998161708657. The reversal of 9998161708651 is 1568071618999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9998161708651 - 2¹ = 9998161708649 is a prime.

Together with 9998161708649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9998161708657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999080854325 + 4999080854326.

It is an arithmetic number, because the mean of its divisors is an integer number (4999080854326).

Almost surely, 2^{9998161708651} is an apocalyptic number.

9998161708651 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998161708651 is an equidigital number, since it uses as much as digits as its factorization.

9998161708651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58786560, while the sum is 70.

The spelling of 9998161708651 in words is "nine trillion, nine hundred ninety-eight billion, one hundred sixty-one million, seven hundred eight thousand, six hundred fifty-one".