9998910685 has 8 divisors (see below), whose sum is σ = 12036545496. Its totient is φ = 7973893440.

The previous prime is 9998910659. The next prime is 9998910697. The reversal of 9998910685 is 5860198999.

It can be written as a sum of positive squares in 4 ways, for example, as 137030436 + 9861880249 = 11706^2 + 99307^2 .

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

It is not a de Polignac number, because 9998910685 - 2¹⁷ = 9998779613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3152646 + ... + 3155815.

It is an arithmetic number, because the mean of its divisors is an integer number (1504568187).

Almost surely, 2^9998910685 is an apocalyptic number.

It is an amenable number.

9998910685 is a deficient number, since it is larger than the sum of its proper divisors (2037634811).

9998910685 is a wasteful number, since it uses less digits than its factorization.

9998910685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308783.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The square root of 9998910685 is about 99994.5532766660. The cubic root of 9998910685 is about 2154.3564585904.

The spelling of 9998910685 in words is "nine billion, nine hundred ninety-eight million, nine hundred ten thousand, six hundred eighty-five".