9985555898 has 4 divisors (see below), whose sum is σ = 14978333850. Its totient is φ = 4992777948.

The previous prime is 9985555883. The next prime is 9985555907. The reversal of 9985555898 is 8985555899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8985555899 = 15923 ⋅564313.

It can be written as a sum of positive squares in only one way, i.e., 8496599329 + 1488956569 = 92177^2 + 38587^2 .

It is a super-2 number, since 2×9985555898² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496388973 + ... + 2496388976.

Almost surely, 2^9985555898 is an apocalyptic number.

9985555898 is a deficient number, since it is larger than the sum of its proper divisors (4992777952).

9985555898 is a wasteful number, since it uses less digits than its factorization.

9985555898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992777951.

The product of its digits is 233280000, while the sum is 71.

The square root of 9985555898 is about 99927.7533921383. The cubic root of 9985555898 is about 2153.3968943900.

Subtracting from 9985555898 its reverse (8985555899), we obtain a palindrome (999999999).

The spelling of 9985555898 in words is "nine billion, nine hundred eighty-five million, five hundred fifty-five thousand, eight hundred ninety-eight".