16765707121 has 2 divisors, whose sum is σ = 16765707122. Its totient is φ = 16765707120.

The previous prime is 16765707097. The next prime is 16765707149. The reversal of 16765707121 is 12170756761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16527930721 + 237776400 = 128561^2 + 15420^2 .

It is a cyclic number.

It is not a de Polignac number, because 16765707121 - 2¹⁵ = 16765674353 is a prime.

It is not a weakly prime, because it can be changed into another prime (16765707151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382853560 + 8382853561.

It is an arithmetic number, because the mean of its divisors is an integer number (8382853561).

Almost surely, 2^16765707121 is an apocalyptic number.

It is an amenable number.

16765707121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16765707121 is an equidigital number, since it uses as much as digits as its factorization.

16765707121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 16765707121 in words is "sixteen billion, seven hundred sixty-five million, seven hundred seven thousand, one hundred twenty-one".