6550025621 has 2 divisors, whose sum is σ = 6550025622. Its totient is φ = 6550025620.

The previous prime is 6550025567. The next prime is 6550025627. The reversal of 6550025621 is 1265200556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3379096900 + 3170928721 = 58130^2 + 56311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6550025621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6550025627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275012810 + 3275012811.

It is an arithmetic number, because the mean of its divisors is an integer number (3275012811).

Almost surely, 2^6550025621 is an apocalyptic number.

It is an amenable number.

6550025621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6550025621 is an equidigital number, since it uses as much as digits as its factorization.

6550025621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 6550025621 is about 80932.2285681051. The cubic root of 6550025621 is about 1871.0310709364.

The spelling of 6550025621 in words is "six billion, five hundred fifty million, twenty-five thousand, six hundred twenty-one".