16776839563481 has 2 divisors, whose sum is σ = 16776839563482. Its totient is φ = 16776839563480.

The previous prime is 16776839563457. The next prime is 16776839563543. The reversal of 16776839563481 is 18436593867761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14471024646400 + 2305814917081 = 3804080^2 + 1518491^2 .

It is a cyclic number.

It is not a de Polignac number, because 16776839563481 - 2⁶ = 16776839563417 is a prime.

It is a super-2 number, since 2×16776839563481² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16776839563399 and 16776839563408.

It is not a weakly prime, because it can be changed into another prime (16776839533481) 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, 8388419781740 + 8388419781741.

It is an arithmetic number, because the mean of its divisors is an integer number (8388419781741).

Almost surely, 2^{16776839563481} is an apocalyptic number.

It is an amenable number.

16776839563481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16776839563481 is an equidigital number, since it uses as much as digits as its factorization.

16776839563481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097349120, while the sum is 74.

The spelling of 16776839563481 in words is "sixteen trillion, seven hundred seventy-six billion, eight hundred thirty-nine million, five hundred sixty-three thousand, four hundred eighty-one".