2158556387328 has 576 divisors, whose sum is σ = 7424519356800. Its totient is φ = 619651399680.

The previous prime is 2158556387327. The next prime is 2158556387333. The reversal of 2158556387328 is 8237836558512.

It is a happy number.

2158556387328 is a `hidden beast` number, since 2 + 1 + 5 + 8 + 556 + 3 + 8 + 73 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158556387327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104001400 + ... + 104022152.

It is an arithmetic number, because the mean of its divisors is an integer number (12889790550).

Almost surely, 2^{2158556387328} 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 2158556387328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3712259678400).

2158556387328 is an abundant number, since it is smaller than the sum of its proper divisors (5265962969472).

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

2158556387328 is a wasteful number, since it uses less digits than its factorization.

2158556387328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20820 (or 20788 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 2158556387328 in words is "two trillion, one hundred fifty-eight billion, five hundred fifty-six million, three hundred eighty-seven thousand, three hundred twenty-eight".