2158799403776 has 144 divisors (see below), whose sum is σ = 4441290061824. Its totient is φ = 1046772314112.

The previous prime is 2158799403773. The next prime is 2158799403781. The reversal of 2158799403776 is 6773049978512.

It is a happy number.

It is a super-2 number, since 2×2158799403776² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2158799403773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623388221 + ... + 623391683.

It is an arithmetic number, because the mean of its divisors is an integer number (30842292096).

It is a 1-persistent number, because it is pandigital, but 2⋅2158799403776 = 4317598807552 is not.

Almost surely, 2^{2158799403776} 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 2158799403776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2220645030912).

2158799403776 is an abundant number, since it is smaller than the sum of its proper divisors (2282490658048).

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

2158799403776 is a wasteful number, since it uses less digits than its factorization.

2158799403776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986 (or 3972 counting only the distinct ones).

The product of its (nonzero) digits is 160030080, while the sum is 68.

The spelling of 2158799403776 in words is "two trillion, one hundred fifty-eight billion, seven hundred ninety-nine million, four hundred three thousand, seven hundred seventy-six".