6651502620 has 144 divisors (see below), whose sum is σ = 22610918400. Its totient is φ = 1430885376.

The previous prime is 6651502607. The next prime is 6651502621. The reversal of 6651502620 is 262051566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651502621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93981 + ... + 148779.

Almost surely, 2^6651502620 is an apocalyptic number.

6651502620 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 6651502620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11305459200).

6651502620 is an abundant number, since it is smaller than the sum of its proper divisors (15959415780).

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

6651502620 is a wasteful number, since it uses less digits than its factorization.

6651502620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54852 (or 54833 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 6651502620 is about 81556.7447854560. The cubic root of 6651502620 is about 1880.6439830188.

The spelling of 6651502620 in words is "six billion, six hundred fifty-one million, five hundred two thousand, six hundred twenty".