1091778653280 has 384 divisors, whose sum is σ = 3983377305600. Its totient is φ = 246205661184.

The previous prime is 1091778653279. The next prime is 1091778653293. The reversal of 1091778653280 is 823568771901.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091778653280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87525124 + ... + 87537596.

It is an arithmetic number, because the mean of its divisors is an integer number (10373378400).

Almost surely, 2^{1091778653280} is an apocalyptic number.

1091778653280 is a gapful number since it is divisible by the number (10) 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 1091778653280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1991688652800).

1091778653280 is an abundant number, since it is smaller than the sum of its proper divisors (2891598652320).

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

1091778653280 is a wasteful number, since it uses less digits than its factorization.

1091778653280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12846 (or 12838 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 1091778653280 in words is "one trillion, ninety-one billion, seven hundred seventy-eight million, six hundred fifty-three thousand, two hundred eighty".