2165657005 has 4 divisors (see below), whose sum is σ = 2598788412. Its totient is φ = 1732525600.

The previous prime is 2165657003. The next prime is 2165657033. The reversal of 2165657005 is 5007565612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1672728201 + 492928804 = 40899^2 + 22202^2 .

It is not a de Polignac number, because 2165657005 - 2¹ = 2165657003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165657003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216565696 + ... + 216565705.

It is an arithmetic number, because the mean of its divisors is an integer number (649697103).

Almost surely, 2^2165657005 is an apocalyptic number.

It is an amenable number.

2165657005 is a deficient number, since it is larger than the sum of its proper divisors (433131407).

2165657005 is an equidigital number, since it uses as much as digits as its factorization.

2165657005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433131406.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 2165657005 is about 46536.6200427147. The cubic root of 2165657005 is about 1293.7883161966.

The spelling of 2165657005 in words is "two billion, one hundred sixty-five million, six hundred fifty-seven thousand, five".