2178236783016 has 160 divisors (see below), whose sum is σ = 6978428624640. Its totient is φ = 621838726272.

The previous prime is 2178236782999. The next prime is 2178236783017. The reversal of 2178236783016 is 6103876328712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2178236783017) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5304225 + ... + 5700111.

It is an arithmetic number, because the mean of its divisors is an integer number (43615178904).

Almost surely, 2^{2178236783016} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178236783016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3489214312320).

2178236783016 is an abundant number, since it is smaller than the sum of its proper divisors (4800191841624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2178236783016 is a wasteful number, since it uses less digits than its factorization.

2178236783016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397125 (or 397112 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 2178236783016 in words is "two trillion, one hundred seventy-eight billion, two hundred thirty-six million, seven hundred eighty-three thousand, sixteen".