16765127681 has 4 divisors (see below), whose sum is σ = 16789674672. Its totient is φ = 16740580692.

The previous prime is 16765127657. The next prime is 16765127719. The reversal of 16765127681 is 18672156761.

It is a happy number.

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-16765127681 is a prime.

It is a super-2 number, since 2×16765127681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16765127611) 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, 12272471 + ... + 12273836.

It is an arithmetic number, because the mean of its divisors is an integer number (4197418668).

Almost surely, 2^16765127681 is an apocalyptic number.

It is an amenable number.

16765127681 is a deficient number, since it is larger than the sum of its proper divisors (24546991).

16765127681 is an equidigital number, since it uses as much as digits as its factorization.

16765127681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24546990.

The product of its digits is 846720, while the sum is 50.

The spelling of 16765127681 in words is "sixteen billion, seven hundred sixty-five million, one hundred twenty-seven thousand, six hundred eighty-one".