9861618544 has 20 divisors (see below), whose sum is σ = 19244349880. Its totient is φ = 4895334720.

The previous prime is 9861618527. The next prime is 9861618551. The reversal of 9861618544 is 4458161689.

9861618544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 9861618491 and 9861618500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2214867 + ... + 2219314.

It is an arithmetic number, because the mean of its divisors is an integer number (962217494).

Almost surely, 2^9861618544 is an apocalyptic number.

It is an amenable number.

9861618544 is a deficient number, since it is larger than the sum of its proper divisors (9382731336).

9861618544 is a wasteful number, since it uses less digits than its factorization.

9861618544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434328 (or 4434322 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The square root of 9861618544 is about 99305.6823348996. The cubic root of 9861618544 is about 2144.4507004804.

The spelling of 9861618544 in words is "nine billion, eight hundred sixty-one million, six hundred eighteen thousand, five hundred forty-four".