2605205217 has 4 divisors (see below), whose sum is σ = 3473606960. Its totient is φ = 1736803476.

The previous prime is 2605205191. The next prime is 2605205237. The reversal of 2605205217 is 7125025062.

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 2605205217 - 2⁸ = 2605204961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605205237) 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, 434200867 + ... + 434200872.

It is an arithmetic number, because the mean of its divisors is an integer number (868401740).

Almost surely, 2^2605205217 is an apocalyptic number.

It is an amenable number.

2605205217 is a deficient number, since it is larger than the sum of its proper divisors (868401743).

2605205217 is an equidigital number, since it uses as much as digits as its factorization.

2605205217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868401742.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 2605205217 is about 51041.2109672175. The cubic root of 2605205217 is about 1375.9858876733.

The spelling of 2605205217 in words is "two billion, six hundred five million, two hundred five thousand, two hundred seventeen".