16065843338821 has 2 divisors, whose sum is σ = 16065843338822. Its totient is φ = 16065843338820.

The previous prime is 16065843338759. The next prime is 16065843338827. The reversal of 16065843338821 is 12883334856061.

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., 10799800553025 + 5266042785796 = 3286305^2 + 2294786^2 .

It is a cyclic number.

It is not a de Polignac number, because 16065843338821 - 2¹⁷ = 16065843207749 is a prime.

It is a super-2 number, since 2×16065843338821² (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 (16065843338827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8032921669410 + 8032921669411.

It is an arithmetic number, because the mean of its divisors is an integer number (8032921669411).

Almost surely, 2^{16065843338821} is an apocalyptic number.

It is an amenable number.

16065843338821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16065843338821 is an equidigital number, since it uses as much as digits as its factorization.

16065843338821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 16065843338821 in words is "sixteen trillion, sixty-five billion, eight hundred forty-three million, three hundred thirty-eight thousand, eight hundred twenty-one".