16043121641 has 2 divisors, whose sum is σ = 16043121642. Its totient is φ = 16043121640.

The previous prime is 16043121623. The next prime is 16043121649. The reversal of 16043121641 is 14612134061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8986281616 + 7056840025 = 94796^2 + 84005^2 .

It is a cyclic number.

It is not a de Polignac number, because 16043121641 - 2²² = 16038927337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16043121649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8021560820 + 8021560821.

It is an arithmetic number, because the mean of its divisors is an integer number (8021560821).

Almost surely, 2^16043121641 is an apocalyptic number.

It is an amenable number.

16043121641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16043121641 is an equidigital number, since it uses as much as digits as its factorization.

16043121641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 16043121641 in words is "sixteen billion, forty-three million, one hundred twenty-one thousand, six hundred forty-one".