2165405520 has 40 divisors (see below), whose sum is σ = 6712757856. Its totient is φ = 577441408.

The previous prime is 2165405519. The next prime is 2165405531. The reversal of 2165405520 is 255045612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4511022 + ... + 4511501.

Almost surely, 2^2165405520 is an apocalyptic number.

2165405520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165405520 is an abundant number, since it is smaller than the sum of its proper divisors (4547352336).

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

2165405520 is a wasteful number, since it uses less digits than its factorization.

2165405520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9022539 (or 9022533 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 2165405520 is about 46533.9179523925. The cubic root of 2165405520 is about 1293.7382342509.

The spelling of 2165405520 in words is "two billion, one hundred sixty-five million, four hundred five thousand, five hundred twenty".