2155797380880 has 2880 divisors, whose sum is σ = 9794905585920. Its totient is φ = 438382264320.

The previous prime is 2155797380879. The next prime is 2155797380911. The reversal of 2155797380880 is 880837975512.

2155797380880 is a `hidden beast` number, since 2 + 1 + 557 + 9 + 73 + 8 + 0 + 8 + 8 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 74337840706 + ... + 74337840734.

It is an arithmetic number, because the mean of its divisors is an integer number (3401008884).

Almost surely, 2^{2155797380880} is an apocalyptic number.

2155797380880 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 2155797380880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4897452792960).

2155797380880 is an abundant number, since it is smaller than the sum of its proper divisors (7639108205040).

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

2155797380880 is a wasteful number, since it uses less digits than its factorization.

2155797380880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 63.

The spelling of 2155797380880 in words is "two trillion, one hundred fifty-five billion, seven hundred ninety-seven million, three hundred eighty thousand, eight hundred eighty".