2165557604 has 48 divisors (see below), whose sum is σ = 4573806720. Its totient is φ = 876407040.

The previous prime is 2165557579. The next prime is 2165557627. The reversal of 2165557604 is 4067555612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162224 + ... + 175064.

It is an arithmetic number, because the mean of its divisors is an integer number (95287640).

Almost surely, 2^2165557604 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 2165557604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2286903360).

2165557604 is an abundant number, since it is smaller than the sum of its proper divisors (2408249116).

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

2165557604 is a wasteful number, since it uses less digits than its factorization.

2165557604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13188 (or 13186 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 2165557604 is about 46535.5520435720. The cubic root of 2165557604 is about 1293.7685214615.

The spelling of 2165557604 in words is "two billion, one hundred sixty-five million, five hundred fifty-seven thousand, six hundred four".