10556716721 has 4 divisors (see below), whose sum is σ = 10705402944. Its totient is φ = 10408030500.

The previous prime is 10556716717. The next prime is 10556716741. The reversal of 10556716721 is 12761765501.

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 not a de Polignac number, because 10556716721 - 2² = 10556716717 is a prime.

It is a super-2 number, since 2×10556716721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10556716741) 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 3 ways as a sum of consecutive naturals, for example, 74343005 + ... + 74343146.

It is an arithmetic number, because the mean of its divisors is an integer number (2676350736).

Almost surely, 2^10556716721 is an apocalyptic number.

It is an amenable number.

10556716721 is a deficient number, since it is larger than the sum of its proper divisors (148686223).

10556716721 is an equidigital number, since it uses as much as digits as its factorization.

10556716721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148686222.

The product of its (nonzero) digits is 88200, while the sum is 41.

The spelling of 10556716721 in words is "ten billion, five hundred fifty-six million, seven hundred sixteen thousand, seven hundred twenty-one".