6654421521 has 12 divisors (see below), whose sum is σ = 10485755280. Its totient is φ = 4032982680.

The previous prime is 6654421493. The next prime is 6654421523. The reversal of 6654421521 is 1251244566.

6654421521 is a `hidden beast` number, since 6 + 65 + 442 + 152 + 1 = 666.

6654421521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6654421521 - 2⁷ = 6654421393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6654421523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33608091 + ... + 33608288.

It is an arithmetic number, because the mean of its divisors is an integer number (873812940).

Almost surely, 2^6654421521 is an apocalyptic number.

It is an amenable number.

6654421521 is a deficient number, since it is larger than the sum of its proper divisors (3831333759).

6654421521 is a wasteful number, since it uses less digits than its factorization.

6654421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67216396 (or 67216393 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 6654421521 is about 81574.6377313439. The cubic root of 6654421521 is about 1880.9190392045.

The spelling of 6654421521 in words is "six billion, six hundred fifty-four million, four hundred twenty-one thousand, five hundred twenty-one".