6646325625 has 45 divisors (see below), whose sum is σ = 12007516521. Its totient is φ = 3541446000.

The previous prime is 6646325603. The next prime is 6646325629. The reversal of 6646325625 is 5265236466.

The square root of 6646325625 is 81525.

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

6646325625 is a `hidden beast` number, since 6 + 6 + 4 + 632 + 5 + 6 + 2 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 521071929 + 6125253696 = 22827^2 + 78264^2 .

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

It is not a de Polignac number, because 6646325625 - 2¹⁵ = 6646292857 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (6646325629) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6113832 + ... + 6114918.

Almost surely, 2^6646325625 is an apocalyptic number.

6646325625 is the 81525-th square number.

6646325625 is the 40763-rd centered octagonal number.

It is an amenable number.

6646325625 is a deficient number, since it is larger than the sum of its proper divisors (5361190896).

6646325625 is an frugal number, since it uses more digits than its factorization.

6646325625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200 (or 1095 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The cubic root of 6646325625 is about 1880.1559423422.

The spelling of 6646325625 in words is "six billion, six hundred forty-six million, three hundred twenty-five thousand, six hundred twenty-five".