6636522780 has 240 divisors, whose sum is σ = 21716158464. Its totient is φ = 1694701440.

The previous prime is 6636522779. The next prime is 6636522803. The reversal of 6636522780 is 872256366.

It is a happy number.

6636522780 is a `hidden beast` number, since 6 + 636 + 5 + 2 + 2 + 7 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5172019 + ... + 5173301.

Almost surely, 2^6636522780 is an apocalyptic number.

6636522780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6636522780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10858079232).

6636522780 is an abundant number, since it is smaller than the sum of its proper divisors (15079635684).

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

6636522780 is a wasteful number, since it uses less digits than its factorization.

6636522780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 6636522780 is about 81464.8561037212. The cubic root of 6636522780 is about 1879.2311232692.

The spelling of 6636522780 in words is "six billion, six hundred thirty-six million, five hundred twenty-two thousand, seven hundred eighty".