8389358880721 has 45 divisors (see below), whose sum is σ = 10600091882331. Its totient is φ = 6636274693776.

The previous prime is 8389358880691. The next prime is 8389358880779. The reversal of 8389358880721 is 1270888539838.

The square root of 8389358880721 is 2896439.

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

It can be written as a sum of positive squares in only one way, i.e., 1241029420225 + 7148329460496 = 1114015^2 + 2673636^2 .

It is not a de Polignac number, because 8389358880721 - 2⁹ = 8389358880209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8389358880121) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1845029370 + ... + 1845033916.

Almost surely, 2^{8389358880721} is an apocalyptic number.

8389358880721 is the 2896439-th square number.

8389358880721 is the 1448220-th centered octagonal number.

It is an amenable number.

8389358880721 is a deficient number, since it is larger than the sum of its proper divisors (2210733001610).

8389358880721 is an frugal number, since it uses more digits than its factorization.

8389358880721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148 (or 4567 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 70.

The spelling of 8389358880721 in words is "eight trillion, three hundred eighty-nine billion, three hundred fifty-eight million, eight hundred eighty thousand, seven hundred twenty-one".