6644132562638 has 16 divisors (see below), whose sum is σ = 10563094168704. Its totient is φ = 3123495555840.

The previous prime is 6644132562593. The next prime is 6644132562673. The reversal of 6644132562638 is 8362652314466.

It is a Curzon number.

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, 98561495 + ... + 98628882.

It is an arithmetic number, because the mean of its divisors is an integer number (660193385544).

Almost surely, 2^{6644132562638} is an apocalyptic number.

6644132562638 is a deficient number, since it is larger than the sum of its proper divisors (3918961606066).

6644132562638 is a wasteful number, since it uses less digits than its factorization.

6644132562638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197191387.

The product of its digits is 29859840, while the sum is 56.

The spelling of 6644132562638 in words is "six trillion, six hundred forty-four billion, one hundred thirty-two million, five hundred sixty-two thousand, six hundred thirty-eight".