9849869617778 has 16 divisors (see below), whose sum is σ = 14839701958080. Its totient is φ = 4903303396656.

The previous prime is 9849869617747. The next prime is 9849869617811. The reversal of 9849869617778 is 8777169689489.

It is a happy number.

It is a super-2 number, since 2×9849869617778² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9849869617693 and 9849869617702.

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, 19196675 + ... + 19703097.

It is an arithmetic number, because the mean of its divisors is an integer number (927481372380).

Almost surely, 2^{9849869617778} is an apocalyptic number.

9849869617778 is a deficient number, since it is larger than the sum of its proper divisors (4989832340302).

9849869617778 is a wasteful number, since it uses less digits than its factorization.

9849869617778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549121.

The product of its digits is 18435465216, while the sum is 89.

The spelling of 9849869617778 in words is "nine trillion, eight hundred forty-nine billion, eight hundred sixty-nine million, six hundred seventeen thousand, seven hundred seventy-eight".