8473693943521 has 9 divisors (see below), whose sum is σ = 9001519837561. Its totient is φ = 7975194783232.

The previous prime is 8473693943471. The next prime is 8473693943563. The reversal of 8473693943521 is 1253493963748.

The square root of 8473693943521 is 2910961.

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

It can be written as a sum of positive squares in 4 ways, for example, as 329291197921 + 8144402745600 = 573839^2 + 2853840^2 .

It is not a de Polignac number, because 8473693943521 - 2²⁷ = 8473559725793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8473693943021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 49400721 + ... + 49571953.

Almost surely, 2^{8473693943521} is an apocalyptic number.

8473693943521 is the 2910961-st square number.

8473693943521 is the 1455481-st centered octagonal number.

It is an amenable number.

8473693943521 is a deficient number, since it is larger than the sum of its proper divisors (527825894040).

8473693943521 is an frugal number, since it uses more digits than its factorization.

8473693943521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342500 (or 171250 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 64.

Multiplying 8473693943521 by its sum of digits (64), we get a square (542316412385344 = 23287688²).

The spelling of 8473693943521 in words is "eight trillion, four hundred seventy-three billion, six hundred ninety-three million, nine hundred forty-three thousand, five hundred twenty-one".