2165500641 has 4 divisors (see below), whose sum is σ = 2887334192. Its totient is φ = 1443667092.

The previous prime is 2165500637. The next prime is 2165500657. The reversal of 2165500641 is 1460055612.

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 2165500641 - 2² = 2165500637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165500599 and 2165500608.

It is not an unprimeable number, because it can be changed into a prime (2165500621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360916771 + ... + 360916776.

It is an arithmetic number, because the mean of its divisors is an integer number (721833548).

Almost surely, 2^2165500641 is an apocalyptic number.

It is an amenable number.

2165500641 is a deficient number, since it is larger than the sum of its proper divisors (721833551).

2165500641 is an equidigital number, since it uses as much as digits as its factorization.

2165500641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721833550.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 2165500641 is about 46534.9400021102. The cubic root of 2165500641 is about 1293.7571775653.

The spelling of 2165500641 in words is "two billion, one hundred sixty-five million, five hundred thousand, six hundred forty-one".