8219659261944 has 128 divisors (see below), whose sum is σ = 22446183997440. Its totient is φ = 2493227423232.

The previous prime is 8219659261939. The next prime is 8219659261969. The reversal of 8219659261944 is 4491629569128.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5560327 + ... + 6881609.

It is an arithmetic number, because the mean of its divisors is an integer number (175360812480).

Almost surely, 2^{8219659261944} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8219659261944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11223091998720).

8219659261944 is an abundant number, since it is smaller than the sum of its proper divisors (14226524735496).

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

8219659261944 is a wasteful number, since it uses less digits than its factorization.

8219659261944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321589 (or 1321585 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 66.

The spelling of 8219659261944 in words is "eight trillion, two hundred nineteen billion, six hundred fifty-nine million, two hundred sixty-one thousand, nine hundred forty-four".