9894378181765 has 64 divisors (see below), whose sum is σ = 15028601794560. Its totient is φ = 6073987645440.

The previous prime is 9894378181739. The next prime is 9894378181769. The reversal of 9894378181765 is 5671818734989.

It is not a de Polignac number, because 9894378181765 - 2²⁵ = 9894344627333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9894378181691 and 9894378181700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9894378181769) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85813944 + ... + 85929166.

It is an arithmetic number, because the mean of its divisors is an integer number (234821903040).

Almost surely, 2^{9894378181765} is an apocalyptic number.

It is an amenable number.

9894378181765 is a deficient number, since it is larger than the sum of its proper divisors (5134223612795).

9894378181765 is a wasteful number, since it uses less digits than its factorization.

9894378181765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118642.

The product of its digits is 731566080, while the sum is 76.

The spelling of 9894378181765 in words is "nine trillion, eight hundred ninety-four billion, three hundred seventy-eight million, one hundred eighty-one thousand, seven hundred sixty-five".