9849403688661 has 48 divisors (see below), whose sum is σ = 14569725730560. Its totient is φ = 6410057472000.

The previous prime is 9849403688603. The next prime is 9849403688681. The reversal of 9849403688661 is 1668863049489.

9849403688661 is a `hidden beast` number, since 9 + 84 + 9 + 403 + 6 + 8 + 86 + 61 = 666.

It is not a de Polignac number, because 9849403688661 - 2²⁷ = 9849269470933 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9849403688661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9849403688681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71173786 + ... + 71312036.

It is an arithmetic number, because the mean of its divisors is an integer number (303535952720).

Almost surely, 2^{9849403688661} is an apocalyptic number.

It is an amenable number.

9849403688661 is a deficient number, since it is larger than the sum of its proper divisors (4720322041899).

9849403688661 is a wasteful number, since it uses less digits than its factorization.

9849403688661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139466 (or 139463 counting only the distinct ones).

The product of its (nonzero) digits is 429981696, while the sum is 72.

The spelling of 9849403688661 in words is "nine trillion, eight hundred forty-nine billion, four hundred three million, six hundred eighty-eight thousand, six hundred sixty-one".