9988754578898 has 8 divisors (see below), whose sum is σ = 14983391998092. Its totient is φ = 4994290579536.

The previous prime is 9988754578897. The next prime is 9988754578909. The reversal of 9988754578898 is 8988754578899.

It can be written as a sum of positive squares in 2 ways, for example, as 9845770013209 + 142984565689 = 3137797^2 + 378133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×9988754578898² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9988754578898.

It is not an unprimeable number, because it can be changed into a prime (9988754578897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43210865 + ... + 43441412.

Almost surely, 2^{9988754578898} is an apocalyptic number.

9988754578898 is a deficient number, since it is larger than the sum of its proper divisors (4994637419194).

9988754578898 is a wasteful number, since it uses less digits than its factorization.

9988754578898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86709916.

The product of its digits is 117050572800, while the sum is 95.

Subtracting from 9988754578898 its reverse (8988754578899), we obtain a palindrome (999999999999).

The spelling of 9988754578898 in words is "nine trillion, nine hundred eighty-eight billion, seven hundred fifty-four million, five hundred seventy-eight thousand, eight hundred ninety-eight".