6561625 has 16 divisors (see below), whose sum is σ = 9360000. Its totient is φ = 4498800.

The previous prime is 6561619. The next prime is 6561629. The reversal of 6561625 is 5261656.

It is not a de Polignac number, because 6561625 - 2⁷ = 6561497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6561629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2875 + ... + 4624.

It is an arithmetic number, because the mean of its divisors is an integer number (585000).

Almost surely, 2^6561625 is an apocalyptic number.

It is an amenable number.

6561625 is a deficient number, since it is larger than the sum of its proper divisors (2798375).

6561625 is an equidigital number, since it uses as much as digits as its factorization.

6561625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7521 (or 7511 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 6561625 is about 2561.5669032840. The cubic root of 6561625 is about 187.2134883413.

Adding to 6561625 its sum of digits (31), we get a palindrome (6561656).

It can be divided in two parts, 6561 and 625, that multiplied together give a 4-th power (4100625 = 45⁴).

The spelling of 6561625 in words is "six million, five hundred sixty-one thousand, six hundred twenty-five".