6564279547225 has 27 divisors (see below), whose sum is σ = 8509375842303. Its totient is φ = 5022875407440.

The previous prime is 6564279547099. The next prime is 6564279547297. The reversal of 6564279547225 is 5227459724656.

The square root of 6564279547225 is 2562085.

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., 2363140637001 + 4201138910224 = 1537251^2 + 2049668^2 .

It is not a de Polignac number, because 6564279547225 - 2⁷ = 6564279547097 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 294628636 + ... + 294650914.

Almost surely, 2^{6564279547225} is an apocalyptic number.

6564279547225 is the 2562085-th square number.

6564279547225 is the 1281043-rd centered octagonal number.

It is an amenable number.

6564279547225 is a deficient number, since it is larger than the sum of its proper divisors (1945096295078).

6564279547225 is an frugal number, since it uses more digits than its factorization.

6564279547225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44614 (or 22307 counting only the distinct ones).

The product of its digits is 254016000, while the sum is 64.

Multiplying 6564279547225 by its sum of digits (64), we get a square (420113891022400 = 20496680²).

The spelling of 6564279547225 in words is "six trillion, five hundred sixty-four billion, two hundred seventy-nine million, five hundred forty-seven thousand, two hundred twenty-five".