16551621041 has 2 divisors, whose sum is σ = 16551621042. Its totient is φ = 16551621040.

The previous prime is 16551621007. The next prime is 16551621113. The reversal of 16551621041 is 14012615561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8678785600 + 7872835441 = 93160^2 + 88729^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551621041 - 2⁶ = 16551620977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16551620989 and 16551621007.

It is not a weakly prime, because it can be changed into another prime (16551621341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275810520 + 8275810521.

It is an arithmetic number, because the mean of its divisors is an integer number (8275810521).

Almost surely, 2^16551621041 is an apocalyptic number.

It is an amenable number.

16551621041 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551621041 is an equidigital number, since it uses as much as digits as its factorization.

16551621041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 16551621041 in words is "sixteen billion, five hundred fifty-one million, six hundred twenty-one thousand, forty-one".