6644146938 has 64 divisors (see below), whose sum is σ = 15656360832. Its totient is φ = 1853153280.

The previous prime is 6644146913. The next prime is 6644146961. The reversal of 6644146938 is 8396414466.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291906 + ... + 313842.

It is an arithmetic number, because the mean of its divisors is an integer number (244630638).

Almost surely, 2^6644146938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6644146938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7828180416).

6644146938 is an abundant number, since it is smaller than the sum of its proper divisors (9012213894).

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

6644146938 is a wasteful number, since it uses less digits than its factorization.

6644146938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22319.

The product of its digits is 2985984, while the sum is 51.

The square root of 6644146938 is about 81511.6368256705. The cubic root of 6644146938 is about 1879.9504794939.

The spelling of 6644146938 in words is "six billion, six hundred forty-four million, one hundred forty-six thousand, nine hundred thirty-eight".