5686818921 has 135 divisors (see below), whose sum is σ = 10502128221. Its totient is φ = 3078578664.

The previous prime is 5686818913. The next prime is 5686818947. The reversal of 5686818921 is 1298186865.

It is a happy number.

The square root of 5686818921 is 75411.

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

5686818921 is a `hidden beast` number, since 568 + 68 + 18 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 5686818921 - 2³ = 5686818913 is a prime.

Its product of digits (1658880) is a multiple of the sum of its prime factors (90).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5686816921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 299306250 + ... + 299306268.

Almost surely, 2^5686818921 is an apocalyptic number.

5686818921 is the 75411-st square number.

5686818921 is the 37706-th centered octagonal number.

It is an amenable number.

5686818921 is a deficient number, since it is larger than the sum of its proper divisors (4815309300).

5686818921 is an frugal number, since it uses more digits than its factorization.

5686818921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 29 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The cubic root of 5686818921 is about 1784.9379909255.

The spelling of 5686818921 in words is "five billion, six hundred eighty-six million, eight hundred eighteen thousand, nine hundred twenty-one".