2605408513 has 4 divisors (see below), whose sum is σ = 2718687168. Its totient is φ = 2492129860.

The previous prime is 2605408501. The next prime is 2605408523. The reversal of 2605408513 is 3158045062.

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-2605408513 is a prime.

It is a super-2 number, since 2×2605408513² = 13576307039225742338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605408523) 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, 56639293 + ... + 56639338.

It is an arithmetic number, because the mean of its divisors is an integer number (679671792).

Almost surely, 2^2605408513 is an apocalyptic number.

2605408513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2605408513 is a deficient number, since it is larger than the sum of its proper divisors (113278655).

2605408513 is a wasteful number, since it uses less digits than its factorization.

2605408513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113278654.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 2605408513 is about 51043.2024171681. The cubic root of 2605408513 is about 1376.0216782192.

The spelling of 2605408513 in words is "two billion, six hundred five million, four hundred eight thousand, five hundred thirteen".