16516687769 has 4 divisors (see below), whose sum is σ = 16599686400. Its totient is φ = 16433689140.

The previous prime is 16516687727. The next prime is 16516687777. The reversal of 16516687769 is 96778661561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96778661561 = 109 ⋅887877629.

It is a cyclic number.

It is not a de Polignac number, because 16516687769 - 2²⁰ = 16515639193 is a prime.

It is a super-2 number, since 2×16516687769² (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 (16516687069) 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, 41499017 + ... + 41499414.

It is an arithmetic number, because the mean of its divisors is an integer number (4149921600).

Almost surely, 2^16516687769 is an apocalyptic number.

It is an amenable number.

16516687769 is a deficient number, since it is larger than the sum of its proper divisors (82998631).

16516687769 is an equidigital number, since it uses as much as digits as its factorization.

16516687769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82998630.

The product of its digits is 22861440, while the sum is 62.

The spelling of 16516687769 in words is "sixteen billion, five hundred sixteen million, six hundred eighty-seven thousand, seven hundred sixty-nine".