6644111672 has 32 divisors (see below), whose sum is σ = 14305507200. Its totient is φ = 2861100000.

The previous prime is 6644111629. The next prime is 6644111693. The reversal of 6644111672 is 2761114466.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

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, 1985204 + ... + 1988547.

It is an arithmetic number, because the mean of its divisors is an integer number (447047100).

Almost surely, 2^6644111672 is an apocalyptic number.

It is an amenable number.

6644111672 is an abundant number, since it is smaller than the sum of its proper divisors (7661395528).

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

6644111672 is a wasteful number, since it uses less digits than its factorization.

6644111672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973787 (or 3973783 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 6644111672 is about 81511.4205004428. The cubic root of 6644111672 is about 1879.9471533357.

The spelling of 6644111672 in words is "six billion, six hundred forty-four million, one hundred eleven thousand, six hundred seventy-two".