8668851521 has 12 divisors (see below), whose sum is σ = 9621096576. Its totient is φ = 7804250520.

The previous prime is 8668851493. The next prime is 8668851551. The reversal of 8668851521 is 1251588668.

It is a happy number.

It is not a de Polignac number, because 8668851521 - 2²⁶ = 8601742657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8668851521.

It is not an unprimeable number, because it can be changed into a prime (8668851551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335321 + ... + 360246.

It is an arithmetic number, because the mean of its divisors is an integer number (801758048).

Almost surely, 2^8668851521 is an apocalyptic number.

It is an amenable number.

8668851521 is a deficient number, since it is larger than the sum of its proper divisors (952245055).

8668851521 is a wasteful number, since it uses less digits than its factorization.

8668851521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695692 (or 695681 counting only the distinct ones).

The product of its digits is 921600, while the sum is 50.

The square root of 8668851521 is about 93106.6674357965. The cubic root of 8668851521 is about 2054.2526449659.

The spelling of 8668851521 in words is "eight billion, six hundred sixty-eight million, eight hundred fifty-one thousand, five hundred twenty-one".