6635520020 has 12 divisors (see below), whose sum is σ = 13934592084. Its totient is φ = 2654208000.

The previous prime is 6635520013. The next prime is 6635520029. The reversal of 6635520020 is 200255366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 688642564 + 5946877456 = 26242^2 + 77116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635520029) 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, 165887981 + ... + 165888020.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216007).

Almost surely, 2^6635520020 is an apocalyptic number.

It is an amenable number.

6635520020 is an abundant number, since it is smaller than the sum of its proper divisors (7299072064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6635520020 is a wasteful number, since it uses less digits than its factorization.

6635520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331776010 (or 331776008 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 6635520020 is about 81458.7013154519. The cubic root of 6635520020 is about 1879.1364696490.

Adding to 6635520020 its reverse (200255366), we get a palindrome (6835775386).

The spelling of 6635520020 in words is "six billion, six hundred thirty-five million, five hundred twenty thousand, twenty".