2155115885832 has 384 divisors, whose sum is σ = 7654801190400. Its totient is φ = 531536338944.

The previous prime is 2155115885821. The next prime is 2155115885833. The reversal of 2155115885832 is 2385885115512.

2155115885832 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 1 + 1 + 58 + 8 + 583 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (2155115885833) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17425669 + ... + 17548907.

It is an arithmetic number, because the mean of its divisors is an integer number (19934378100).

Almost surely, 2^{2155115885832} 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 2155115885832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3827400595200).

2155115885832 is an abundant number, since it is smaller than the sum of its proper divisors (5499685304568).

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

2155115885832 is a wasteful number, since it uses less digits than its factorization.

2155115885832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123445 (or 123438 counting only the distinct ones).

The product of its digits is 3840000, while the sum is 54.

The spelling of 2155115885832 in words is "two trillion, one hundred fifty-five billion, one hundred fifteen million, eight hundred eighty-five thousand, eight hundred thirty-two".