16517378477 has 2 divisors, whose sum is σ = 16517378478. Its totient is φ = 16517378476.

The previous prime is 16517378473. The next prime is 16517378497. The reversal of 16517378477 is 77487371561.

16517378477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16297330921 + 220047556 = 127661^2 + 14834^2 .

It is a cyclic number.

It is not a de Polignac number, because 16517378477 - 2² = 16517378473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16517378473) 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, 8258689238 + 8258689239.

It is an arithmetic number, because the mean of its divisors is an integer number (8258689239).

Almost surely, 2^16517378477 is an apocalyptic number.

It is an amenable number.

16517378477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16517378477 is an equidigital number, since it uses as much as digits as its factorization.

16517378477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 56.

The spelling of 16517378477 in words is "sixteen billion, five hundred seventeen million, three hundred seventy-eight thousand, four hundred seventy-seven".