6636817445 has 6 divisors (see below), whose sum is σ = 7964399538. Its totient is φ = 5309308224.

The previous prime is 6636817441. The next prime is 6636817457. The reversal of 6636817445 is 5447186366.

It can be written as a sum of positive squares in 3 ways, for example, as 3147434404 + 3489383041 = 56102^2 + 59071^2 .

It is not a de Polignac number, because 6636817445 - 2² = 6636817441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6636817393 and 6636817402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6636817441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163949 + ... + 200381.

It is an arithmetic number, because the mean of its divisors is an integer number (1327399923).

Almost surely, 2^6636817445 is an apocalyptic number.

It is an amenable number.

6636817445 is a deficient number, since it is larger than the sum of its proper divisors (1327582093).

6636817445 is an frugal number, since it uses more digits than its factorization.

6636817445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72871 (or 36438 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 50.

The square root of 6636817445 is about 81466.6646242498. The cubic root of 6636817445 is about 1879.2589357980.

The spelling of 6636817445 in words is "six billion, six hundred thirty-six million, eight hundred seventeen thousand, four hundred forty-five".