6561242506 has 32 divisors (see below), whose sum is σ = 12166035840. Its totient is φ = 2584305216.

The previous prime is 6561242503. The next prime is 6561242521. The reversal of 6561242506 is 6052421656.

It is not an unprimeable number, because it can be changed into a prime (6561242503) 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, 37036 + ... + 120391.

It is an arithmetic number, because the mean of its divisors is an integer number (380188620).

Almost surely, 2^6561242506 is an apocalyptic number.

6561242506 is a deficient number, since it is larger than the sum of its proper divisors (5604793334).

6561242506 is a wasteful number, since it uses less digits than its factorization.

6561242506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157678.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 6561242506 is about 81001.4969367851. The cubic root of 6561242506 is about 1872.0985055200.

The spelling of 6561242506 in words is "six billion, five hundred sixty-one million, two hundred forty-two thousand, five hundred six".