8743322661921 has 81 divisors (see below), whose sum is σ = 13141118889171. Its totient is φ = 5601761440704.

The previous prime is 8743322661911. The next prime is 8743322662043. The reversal of 8743322661921 is 1291662233478.

The square root of 8743322661921 is 2956911.

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

8743322661921 is a `hidden beast` number, since 8 + 74 + 3 + 322 + 66 + 192 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55778630625 + 8687544031296 = 236175^2 + 2947464^2 .

It is not a de Polignac number, because 8743322661921 - 2⁷ = 8743322661793 is a prime.

It is a super-2 number, since 2×8743322661921² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8743322661911) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 27933938061 + ... + 27933938373.

Almost surely, 2^{8743322661921} is an apocalyptic number.

8743322661921 is the 2956911-st square number.

8743322661921 is the 1478456-th centered octagonal number.

It is an amenable number.

8743322661921 is a deficient number, since it is larger than the sum of its proper divisors (4397796227250).

8743322661921 is an frugal number, since it uses more digits than its factorization.

8743322661921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 430 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 8743322661921 in words is "eight trillion, seven hundred forty-three billion, three hundred twenty-two million, six hundred sixty-one thousand, nine hundred twenty-one".