16777221134081 has 2 divisors, whose sum is σ = 16777221134082. Its totient is φ = 16777221134080.

The previous prime is 16777221134077. The next prime is 16777221134087. The reversal of 16777221134081 is 18043112277761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13949358493456 + 2827862640625 = 3734884^2 + 1681625^2 .

It is a cyclic number.

It is not a de Polignac number, because 16777221134081 - 2² = 16777221134077 is a prime.

It is a super-2 number, since 2×16777221134081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16777221134087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8388610567040 + 8388610567041.

It is an arithmetic number, because the mean of its divisors is an integer number (8388610567041).

Almost surely, 2^{16777221134081} is an apocalyptic number.

It is an amenable number.

16777221134081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16777221134081 is an equidigital number, since it uses as much as digits as its factorization.

16777221134081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 16777221134081 in words is "sixteen trillion, seven hundred seventy-seven billion, two hundred twenty-one million, one hundred thirty-four thousand, eighty-one".