9999858817 has 16 divisors (see below), whose sum is σ = 10839104640. Its totient is φ = 9170796672.

The previous prime is 9999858809. The next prime is 9999858863. The reversal of 9999858817 is 7188589999.

It is a cyclic number.

It is not a de Polignac number, because 9999858817 - 2³ = 9999858809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9999858817.

It is not an unprimeable number, because it can be changed into a prime (9999858917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1471734 + ... + 1478512.

It is an arithmetic number, because the mean of its divisors is an integer number (677444040).

Almost surely, 2^9999858817 is an apocalyptic number.

It is an amenable number.

9999858817 is a deficient number, since it is larger than the sum of its proper divisors (839245823).

9999858817 is a wasteful number, since it uses less digits than its factorization.

9999858817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512.

The product of its digits is 117573120, while the sum is 73.

The square root of 9999858817 is about 99999.2940825084. The cubic root of 9999858817 is about 2154.4245509991.

The spelling of 9999858817 in words is "nine billion, nine hundred ninety-nine million, eight hundred fifty-eight thousand, eight hundred seventeen".