2158578816 has 128 divisors (see below), whose sum is σ = 5936481600. Its totient is φ = 694407168.

The previous prime is 2158578811. The next prime is 2158578827. The reversal of 2158578816 is 6188758512.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (2158578811) 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, 1974366 + ... + 1975458.

Almost surely, 2^2158578816 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 2158578816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2968240800).

2158578816 is an abundant number, since it is smaller than the sum of its proper divisors (3777902784).

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

2158578816 is a wasteful number, since it uses less digits than its factorization.

2158578816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1274 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 51.

The square root of 2158578816 is about 46460.5081332523. The cubic root of 2158578816 is about 1292.3772473639.

The spelling of 2158578816 in words is "two billion, one hundred fifty-eight million, five hundred seventy-eight thousand, eight hundred sixteen".