16621746484081 has 2 divisors, whose sum is σ = 16621746484082. Its totient is φ = 16621746484080.

The previous prime is 16621746484051. The next prime is 16621746484127. The reversal of 16621746484081 is 18048464712661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10168541104225 + 6453205379856 = 3188815^2 + 2540316^2 .

It is a cyclic number.

It is not a de Polignac number, because 16621746484081 - 2⁹ = 16621746483569 is a prime.

It is a super-2 number, since 2×16621746484081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16621746484051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310873242040 + 8310873242041.

It is an arithmetic number, because the mean of its divisors is an integer number (8310873242041).

Almost surely, 2^{16621746484081} is an apocalyptic number.

It is an amenable number.

16621746484081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16621746484081 is an equidigital number, since it uses as much as digits as its factorization.

16621746484081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12386304, while the sum is 58.

The spelling of 16621746484081 in words is "sixteen trillion, six hundred twenty-one billion, seven hundred forty-six million, four hundred eighty-four thousand, eighty-one".