2165520413 has 4 divisors (see below), whose sum is σ = 2474880480. Its totient is φ = 1856160348.

The previous prime is 2165520391. The next prime is 2165520431. The reversal of 2165520413 is 3140255612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2165520413 - 2⁸ = 2165520157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165520443) 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, 154680023 + ... + 154680036.

It is an arithmetic number, because the mean of its divisors is an integer number (618720120).

Almost surely, 2^2165520413 is an apocalyptic number.

It is an amenable number.

2165520413 is a deficient number, since it is larger than the sum of its proper divisors (309360067).

2165520413 is an equidigital number, since it uses as much as digits as its factorization.

2165520413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309360066.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 2165520413 is about 46535.1524441470. The cubic root of 2165520413 is about 1293.7611150826.

The spelling of 2165520413 in words is "two billion, one hundred sixty-five million, five hundred twenty thousand, four hundred thirteen".