2178726318720 has 512 divisors, whose sum is σ = 8826389337600. Its totient is φ = 497557831680.

The previous prime is 2178726318683. The next prime is 2178726318799. The reversal of 2178726318720 is 278136278712.

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

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 63 ways as a sum of consecutive naturals, for example, 149620240 + ... + 149634800.

It is an arithmetic number, because the mean of its divisors is an integer number (17239041675).

Almost surely, 2^{2178726318720} is an apocalyptic number.

2178726318720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178726318720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4413194668800).

2178726318720 is an abundant number, since it is smaller than the sum of its proper divisors (6647663018880).

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

2178726318720 is a wasteful number, since it uses less digits than its factorization.

2178726318720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15833 (or 15815 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 2178726318720 in words is "two trillion, one hundred seventy-eight billion, seven hundred twenty-six million, three hundred eighteen thousand, seven hundred twenty".