6561724715 has 16 divisors (see below), whose sum is σ = 9691163328. Its totient is φ = 4153355136.

The previous prime is 6561724711. The next prime is 6561724723. The reversal of 6561724715 is 5174271656.

6561724715 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6561724715 - 2² = 6561724711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6561724711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7210232 + ... + 7211141.

It is an arithmetic number, because the mean of its divisors is an integer number (605697708).

Almost surely, 2^6561724715 is an apocalyptic number.

6561724715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6561724715 is a deficient number, since it is larger than the sum of its proper divisors (3129438613).

6561724715 is a wasteful number, since it uses less digits than its factorization.

6561724715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14421398.

The product of its digits is 352800, while the sum is 44.

The square root of 6561724715 is about 81004.4734258547. The cubic root of 6561724715 is about 1872.1443667845.

The spelling of 6561724715 in words is "six billion, five hundred sixty-one million, seven hundred twenty-four thousand, seven hundred fifteen".