2161537896 has 128 divisors (see below), whose sum is σ = 6678650880. Its totient is φ = 568851456.

The previous prime is 2161537877. The next prime is 2161537901. The reversal of 2161537896 is 6987351612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126181 + ... + 142283.

It is an arithmetic number, because the mean of its divisors is an integer number (52176960).

Almost surely, 2^2161537896 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 2161537896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3339325440).

2161537896 is an abundant number, since it is smaller than the sum of its proper divisors (4517112984).

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

2161537896 is a wasteful number, since it uses less digits than its factorization.

2161537896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16183 (or 16179 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 2161537896 is about 46492.3423372065. The cubic root of 2161537896 is about 1292.9675279506.

The spelling of 2161537896 in words is "two billion, one hundred sixty-one million, five hundred thirty-seven thousand, eight hundred ninety-six".