9998888671 has 2 divisors, whose sum is σ = 9998888672. Its totient is φ = 9998888670.

The previous prime is 9998888659. The next prime is 9998888687. The reversal of 9998888671 is 1768888999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9998888671 - 2¹⁵ = 9998855903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9998888594 and 9998888603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998888971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999444335 + 4999444336.

It is an arithmetic number, because the mean of its divisors is an integer number (4999444336).

Almost surely, 2^9998888671 is an apocalyptic number.

9998888671 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998888671 is an equidigital number, since it uses as much as digits as its factorization.

9998888671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 73.

The square root of 9998888671 is about 99994.4432006099. The cubic root of 9998888671 is about 2154.3548775502.

The spelling of 9998888671 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-eight thousand, six hundred seventy-one".