6631612500 has 144 divisors (see below), whose sum is σ = 19568122560. Its totient is φ = 1747680000.

The previous prime is 6631612489. The next prime is 6631612523. The reversal of 6631612500 is 52161366.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3336507 + ... + 3338493.

It is an arithmetic number, because the mean of its divisors is an integer number (135889740).

Almost surely, 2^6631612500 is an apocalyptic number.

6631612500 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 6631612500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9784061280).

6631612500 is an abundant number, since it is smaller than the sum of its proper divisors (12936510060).

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

6631612500 is a wasteful number, since it uses less digits than its factorization.

6631612500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6631612500 is about 81434.7131142488. The cubic root of 6631612500 is about 1878.7675357337.

Adding to 6631612500 its reverse (52161366), we get a palindrome (6683773866).

The spelling of 6631612500 in words is "six billion, six hundred thirty-one million, six hundred twelve thousand, five hundred".