9978148185 has 32 divisors (see below), whose sum is σ = 16047390720. Its totient is φ = 5294289600.

The previous prime is 9978148177. The next prime is 9978148217. The reversal of 9978148185 is 5818418799.

It is a happy number.

It is not a de Polignac number, because 9978148185 - 2³ = 9978148177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3734400 + ... + 3737070.

It is an arithmetic number, because the mean of its divisors is an integer number (501480960).

Almost surely, 2^9978148185 is an apocalyptic number.

It is an amenable number.

9978148185 is a deficient number, since it is larger than the sum of its proper divisors (6069242535).

9978148185 is a wasteful number, since it uses less digits than its factorization.

9978148185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869.

The product of its digits is 5806080, while the sum is 60.

The square root of 9978148185 is about 99890.6811719692. The cubic root of 9978148185 is about 2152.8642686480.

The spelling of 9978148185 in words is "nine billion, nine hundred seventy-eight million, one hundred forty-eight thousand, one hundred eighty-five".