8438847061521 has 16 divisors (see below), whose sum is σ = 11340555367680. Its totient is φ = 5581574192400.

The previous prime is 8438847061387. The next prime is 8438847061553. The reversal of 8438847061521 is 1251607488348.

It is not a de Polignac number, because 8438847061521 - 2¹⁵ = 8438847028753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8438847061571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6368415 + ... + 7578548.

It is an arithmetic number, because the mean of its divisors is an integer number (708784710480).

Almost surely, 2^{8438847061521} is an apocalyptic number.

It is an amenable number.

8438847061521 is a deficient number, since it is larger than the sum of its proper divisors (2901708306159).

8438847061521 is a wasteful number, since it uses less digits than its factorization.

8438847061521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13948556.

The product of its (nonzero) digits is 10321920, while the sum is 57.

The spelling of 8438847061521 in words is "eight trillion, four hundred thirty-eight billion, eight hundred forty-seven million, sixty-one thousand, five hundred twenty-one".