9998777512 has 32 divisors (see below), whose sum is σ = 19748181600. Its totient is φ = 4732962624.

The previous prime is 9998777429. The next prime is 9998777513. The reversal of 9998777512 is 2157778999.

It is not an unprimeable number, because it can be changed into a prime (9998777513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203238 + ... + 247594.

It is an arithmetic number, because the mean of its divisors is an integer number (617130675).

Almost surely, 2^9998777512 is an apocalyptic number.

It is an amenable number.

9998777512 is a deficient number, since it is larger than the sum of its proper divisors (9749404088).

9998777512 is a wasteful number, since it uses less digits than its factorization.

9998777512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45865 (or 45861 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 64.

The square root of 9998777512 is about 99993.8873731790. The cubic root of 9998777512 is about 2154.3468941023.

The spelling of 9998777512 in words is "nine billion, nine hundred ninety-eight million, seven hundred seventy-seven thousand, five hundred twelve".