6724907561 has 4 divisors (see below), whose sum is σ = 6725388624. Its totient is φ = 6724426500.

The previous prime is 6724907513. The next prime is 6724907591. The reversal of 6724907561 is 1657094276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6724907561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6724907591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218915 + ... + 247736.

It is an arithmetic number, because the mean of its divisors is an integer number (1681347156).

Almost surely, 2^6724907561 is an apocalyptic number.

It is an amenable number.

6724907561 is a deficient number, since it is larger than the sum of its proper divisors (481063).

6724907561 is a wasteful number, since it uses less digits than its factorization.

6724907561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481062.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 6724907561 is about 82005.5337218166. The cubic root of 6724907561 is about 1887.5368527869.

The spelling of 6724907561 in words is "six billion, seven hundred twenty-four million, nine hundred seven thousand, five hundred sixty-one".