6466572225 has 45 divisors (see below), whose sum is σ = 11985033907. Its totient is φ = 3446908560.

The previous prime is 6466572173. The next prime is 6466572227. The reversal of 6466572225 is 5222756646.

The square root of 6466572225 is 80415.

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

It can be written as a sum of positive squares in only one way, i.e., 2327966001 + 4138606224 = 48249^2 + 64332^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 6466572225 - 2¹⁷ = 6466441153 is a prime.

It is a super-2 number, since 2×6466572225² = 83633112682282901250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6466572227) 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 44 ways as a sum of consecutive naturals, for example, 3617782 + ... + 3619568.

Almost surely, 2^6466572225 is an apocalyptic number.

6466572225 is the 80415-th square number.

6466572225 is the 40208-th centered octagonal number.

It is an amenable number.

6466572225 is a deficient number, since it is larger than the sum of its proper divisors (5518461682).

6466572225 is an frugal number, since it uses more digits than its factorization.

6466572225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596 (or 1795 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The cubic root of 6466572225 is about 1863.0508593862.

The spelling of 6466572225 in words is "six billion, four hundred sixty-six million, five hundred seventy-two thousand, two hundred twenty-five".