2165732555 has 16 divisors (see below), whose sum is σ = 3099285504. Its totient is φ = 1420504800.

The previous prime is 2165732551. The next prime is 2165732563. The reversal of 2165732555 is 5552375612.

It is a happy number.

It is not a de Polignac number, because 2165732555 - 2² = 2165732551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165732551) 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, 1344371 + ... + 1345980.

It is an arithmetic number, because the mean of its divisors is an integer number (193705344).

Almost surely, 2^2165732555 is an apocalyptic number.

2165732555 is a deficient number, since it is larger than the sum of its proper divisors (933552949).

2165732555 is a wasteful number, since it uses less digits than its factorization.

2165732555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690386.

The product of its digits is 315000, while the sum is 41.

The square root of 2165732555 is about 46537.4317619698. The cubic root of 2165732555 is about 1293.8033608336.

The spelling of 2165732555 in words is "two billion, one hundred sixty-five million, seven hundred thirty-two thousand, five hundred fifty-five".