16564641716751 has 4 divisors (see below), whose sum is σ = 22086188955672. Its totient is φ = 11043094477832.

The previous prime is 16564641716747. The next prime is 16564641716809. The reversal of 16564641716751 is 15761714646561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16564641716751 - 2² = 16564641716747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564641716741) 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, 2760773619456 + ... + 2760773619461.

It is an arithmetic number, because the mean of its divisors is an integer number (5521547238918).

Almost surely, 2^{16564641716751} is an apocalyptic number.

16564641716751 is a deficient number, since it is larger than the sum of its proper divisors (5521547238921).

16564641716751 is an equidigital number, since it uses as much as digits as its factorization.

16564641716751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5521547238920.

The product of its digits is 25401600, while the sum is 60.

The spelling of 16564641716751 in words is "sixteen trillion, five hundred sixty-four billion, six hundred forty-one million, seven hundred sixteen thousand, seven hundred fifty-one".