9999899578481 has 2 divisors, whose sum is σ = 9999899578482. Its totient is φ = 9999899578480.

The previous prime is 9999899578477. The next prime is 9999899578483. The reversal of 9999899578481 is 1848759989999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9760469430625 + 239430147856 = 3124175^2 + 489316^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999899578481 - 2² = 9999899578477 is a prime.

It is a super-2 number, since 2×9999899578481² (a number of 27 digits) contains 22 as substring.

Together with 9999899578483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9999899578483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999949789240 + 4999949789241.

It is an arithmetic number, because the mean of its divisors is an integer number (4999949789241).

Almost surely, 2^{9999899578481} is an apocalyptic number.

It is an amenable number.

9999899578481 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999899578481 is an equidigital number, since it uses as much as digits as its factorization.

9999899578481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38093690880, while the sum is 95.

The spelling of 9999899578481 in words is "nine trillion, nine hundred ninety-nine billion, eight hundred ninety-nine million, five hundred seventy-eight thousand, four hundred eighty-one".