2165345557 has 4 divisors (see below), whose sum is σ = 2259491040. Its totient is φ = 2071200076.

The previous prime is 2165345537. The next prime is 2165345563. The reversal of 2165345557 is 7555435612.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2165345557 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 (2165345527) 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, 47072707 + ... + 47072752.

It is an arithmetic number, because the mean of its divisors is an integer number (564872760).

Almost surely, 2^2165345557 is an apocalyptic number.

It is an amenable number.

2165345557 is a deficient number, since it is larger than the sum of its proper divisors (94145483).

2165345557 is an equidigital number, since it uses as much as digits as its factorization.

2165345557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94145482.

The product of its digits is 630000, while the sum is 43.

The square root of 2165345557 is about 46533.2736544507. The cubic root of 2165345557 is about 1293.7262923550.

The spelling of 2165345557 in words is "two billion, one hundred sixty-five million, three hundred forty-five thousand, five hundred fifty-seven".