6621631320 has 64 divisors (see below), whose sum is σ = 20239722720. Its totient is φ = 1732450304.

The previous prime is 6621631273. The next prime is 6621631321. The reversal of 6621631320 is 231361266.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621631321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514209 + ... + 526928.

Almost surely, 2^6621631320 is an apocalyptic number.

6621631320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6621631320 is an abundant number, since it is smaller than the sum of its proper divisors (13618091400).

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

6621631320 is a wasteful number, since it uses less digits than its factorization.

6621631320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041204 (or 1041200 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6621631320 is about 81373.4067125127. The cubic root of 6621631320 is about 1877.8244904433.

Adding to 6621631320 its reverse (231361266), we get a palindrome (6852992586).

The spelling of 6621631320 in words is "six billion, six hundred twenty-one million, six hundred thirty-one thousand, three hundred twenty".