6450025221 has 20 divisors (see below), whose sum is σ = 9677325900. Its totient is φ = 4281227136.

The previous prime is 6450025207. The next prime is 6450025223. The reversal of 6450025221 is 1225200546.

6450025221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4591553121 + 1858472100 = 67761^2 + 43110^2 .

It is not a de Polignac number, because 6450025221 - 2⁵ = 6450025189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6450025223) 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 19 ways as a sum of consecutive naturals, for example, 155316 + ... + 192413.

It is an arithmetic number, because the mean of its divisors is an integer number (483866295).

Almost surely, 2^6450025221 is an apocalyptic number.

It is an amenable number.

6450025221 is a deficient number, since it is larger than the sum of its proper divisors (3227300679).

6450025221 is a wasteful number, since it uses less digits than its factorization.

6450025221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347970 (or 347961 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 6450025221 is about 80312.0490399791. The cubic root of 6450025221 is about 1861.4604113052.

Adding to 6450025221 its reverse (1225200546), we get a palindrome (7675225767).

The spelling of 6450025221 in words is "six billion, four hundred fifty million, twenty-five thousand, two hundred twenty-one".