6644631020 has 24 divisors (see below), whose sum is σ = 14026032384. Its totient is φ = 2644079616.

The previous prime is 6644631017. The next prime is 6644631031. The reversal of 6644631020 is 201364466.

It is a super-2 number, since 2×6644631020² = 88302242783892480800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856844 + ... + 864563.

It is an arithmetic number, because the mean of its divisors is an integer number (584418016).

Almost surely, 2^6644631020 is an apocalyptic number.

It is an amenable number.

6644631020 is an abundant number, since it is smaller than the sum of its proper divisors (7381401364).

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

6644631020 is a wasteful number, since it uses less digits than its factorization.

6644631020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721609 (or 1721607 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 6644631020 is about 81514.6061758259. The cubic root of 6644631020 is about 1879.9961351211.

Adding to 6644631020 its reverse (201364466), we get a palindrome (6845995486).

The spelling of 6644631020 in words is "six billion, six hundred forty-four million, six hundred thirty-one thousand, twenty".