20116728061709 has 2 divisors, whose sum is σ = 20116728061710. Its totient is φ = 20116728061708.

The previous prime is 20116728061673. The next prime is 20116728061723. The reversal of 20116728061709 is 90716082761102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10127809786084 + 9988918275625 = 3182422^2 + 3160525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116728061709 - 2²⁴ = 20116711284493 is a prime.

It is a super-2 number, since 2×20116728061709² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116728061789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058364030854 + 10058364030855.

It is an arithmetic number, because the mean of its divisors is an integer number (10058364030855).

Almost surely, 2^{20116728061709} is an apocalyptic number.

It is an amenable number.

20116728061709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116728061709 is an equidigital number, since it uses as much as digits as its factorization.

20116728061709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 20116728061709 in words is "twenty trillion, one hundred sixteen billion, seven hundred twenty-eight million, sixty-one thousand, seven hundred nine".