9990849685 has 8 divisors (see below), whose sum is σ = 11989572480. Its totient is φ = 7992311184.

The previous prime is 9990849683. The next prime is 9990849691. The reversal of 9990849685 is 5869480999.

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

It is a cyclic number.

It is not a de Polignac number, because 9990849685 - 2¹ = 9990849683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9990849685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990849683) 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, 145984 + ... + 203206.

It is an arithmetic number, because the mean of its divisors is an integer number (1498696560).

Almost surely, 2^9990849685 is an apocalyptic number.

It is an amenable number.

9990849685 is a deficient number, since it is larger than the sum of its proper divisors (1998722795).

9990849685 is a wasteful number, since it uses less digits than its factorization.

9990849685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92147.

The product of its (nonzero) digits is 50388480, while the sum is 67.

The square root of 9990849685 is about 99954.2379541758. The cubic root of 9990849685 is about 2153.7773642978. Note that the first 3 decimals are identical.

The spelling of 9990849685 in words is "nine billion, nine hundred ninety million, eight hundred forty-nine thousand, six hundred eighty-five".