8643376561444 has 81 divisors (see below), whose sum is σ = 15810513158713. Its totient is φ = 4134386241664.

The previous prime is 8643376561433. The next prime is 8643376561481. The reversal of 8643376561444 is 4441656733468.

It is a happy number.

The square root of 8643376561444 is 2939962.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 616127663844 + 8027248897600 = 784938^2 + 2833240^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 29499578562 + ... + 29499578854.

Almost surely, 2^{8643376561444} is an apocalyptic number.

8643376561444 is the 2939962-nd square number.

It is an amenable number.

8643376561444 is a deficient number, since it is larger than the sum of its proper divisors (7167136597269).

8643376561444 is an equidigital number, since it uses as much as digits as its factorization.

8643376561444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994 (or 497 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 61.

The spelling of 8643376561444 in words is "eight trillion, six hundred forty-three billion, three hundred seventy-six million, five hundred sixty-one thousand, four hundred forty-four".