6561375025 has 24 divisors (see below), whose sum is σ = 8629072704. Its totient is φ = 4938542400.

The previous prime is 6561375011. The next prime is 6561375047. The reversal of 6561375025 is 5205731656.

It is not a de Polignac number, because 6561375025 - 2⁵ = 6561374993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58459 + ... + 128608.

It is an arithmetic number, because the mean of its divisors is an integer number (359544696).

Almost surely, 2^6561375025 is an apocalyptic number.

It is an amenable number.

6561375025 is a deficient number, since it is larger than the sum of its proper divisors (2067697679).

6561375025 is a wasteful number, since it uses less digits than its factorization.

6561375025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187161 (or 187156 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 40.

The square root of 6561375025 is about 81002.3149360560. The cubic root of 6561375025 is about 1872.1111091771. Note that the first 4 decimals are identical.

The spelling of 6561375025 in words is "six billion, five hundred sixty-one million, three hundred seventy-five thousand, twenty-five".