6636557020 has 24 divisors (see below), whose sum is σ = 14127687504. Its totient is φ = 2618257536.

The previous prime is 6636556921. The next prime is 6636557033. The reversal of 6636557020 is 207556366.

It is a super-2 number, since 2×6636557020² = 88087778159422560800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2271334 + ... + 2274253.

It is an arithmetic number, because the mean of its divisors is an integer number (588653646).

Almost surely, 2^6636557020 is an apocalyptic number.

It is an amenable number.

6636557020 is an abundant number, since it is smaller than the sum of its proper divisors (7491130484).

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

6636557020 is a wasteful number, since it uses less digits than its factorization.

6636557020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545669 (or 4545667 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 40.

The square root of 6636557020 is about 81465.0662554202. The cubic root of 6636557020 is about 1879.2343551204.

The spelling of 6636557020 in words is "six billion, six hundred thirty-six million, five hundred fifty-seven thousand, twenty".