16541033681 has 2 divisors, whose sum is σ = 16541033682. Its totient is φ = 16541033680.

The previous prime is 16541033657. The next prime is 16541033683. The reversal of 16541033681 is 18633014561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15926440000 + 614593681 = 126200^2 + 24791^2 .

It is a cyclic number.

It is not a de Polignac number, because 16541033681 - 2⁶ = 16541033617 is a prime.

It is a super-2 number, since 2×16541033681² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 16541033683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16541033683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270516840 + 8270516841.

It is an arithmetic number, because the mean of its divisors is an integer number (8270516841).

Almost surely, 2^16541033681 is an apocalyptic number.

It is an amenable number.

16541033681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16541033681 is an equidigital number, since it uses as much as digits as its factorization.

16541033681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 16541033681 in words is "sixteen billion, five hundred forty-one million, thirty-three thousand, six hundred eighty-one".