6617258561 has 4 divisors (see below), whose sum is σ = 6617452500. Its totient is φ = 6617064624.

The previous prime is 6617258503. The next prime is 6617258567. The reversal of 6617258561 is 1658527166.

6617258561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1658527166 = 2 ⋅829263583.

It can be written as a sum of positive squares in 2 ways, for example, as 36966400 + 6580292161 = 6080^2 + 81119^2 .

It is a cyclic number.

It is not a de Polignac number, because 6617258561 - 2²² = 6613064257 is a prime.

It is a super-2 number, since 2×6617258561² = 87576221726255581442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6617258567) 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, 30686 + ... + 119063.

It is an arithmetic number, because the mean of its divisors is an integer number (1654363125).

Almost surely, 2^6617258561 is an apocalyptic number.

It is an amenable number.

6617258561 is a deficient number, since it is larger than the sum of its proper divisors (193939).

6617258561 is a wasteful number, since it uses less digits than its factorization.

6617258561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193938.

The product of its digits is 604800, while the sum is 47.

The square root of 6617258561 is about 81346.5337983125. The cubic root of 6617258561 is about 1877.4110433780.

The spelling of 6617258561 in words is "six billion, six hundred seventeen million, two hundred fifty-eight thousand, five hundred sixty-one".