789945886521 has 81 divisors (see below), whose sum is σ = 1312214848581. Its totient is φ = 457548577200.

The previous prime is 789945886487. The next prime is 789945886531. The reversal of 789945886521 is 125688549987.

The square root of 789945886521 is 888789.

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

789945886521 is a `hidden beast` number, since 7 + 8 + 9 + 94 + 5 + 8 + 8 + 6 + 521 = 666.

It is not a de Polignac number, because 789945886521 - 2¹⁷ = 789945755449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 789945886521.

It is not an unprimeable number, because it can be changed into a prime (789945886531) 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, 674590266 + ... + 674591436.

Almost surely, 2^789945886521 is an apocalyptic number.

789945886521 is the 888789-th square number.

789945886521 is the 444395-th centered octagonal number.

It is an amenable number.

789945886521 is a deficient number, since it is larger than the sum of its proper divisors (522268962060).

789945886521 is a wasteful number, since it uses less digits than its factorization.

789945886521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416 (or 1208 counting only the distinct ones).

The product of its digits is 348364800, while the sum is 72.

The spelling of 789945886521 in words is "seven hundred eighty-nine billion, nine hundred forty-five million, eight hundred eighty-six thousand, five hundred twenty-one".