13438756477 has 2 divisors, whose sum is σ = 13438756478. Its totient is φ = 13438756476.

The previous prime is 13438756349. The next prime is 13438756489. The reversal of 13438756477 is 77465783431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9443758041 + 3994998436 = 97179^2 + 63206^2 .

It is an emirp because it is prime and its reverse (77465783431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13438756477 - 2⁷ = 13438756349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13438756777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6719378238 + 6719378239.

It is an arithmetic number, because the mean of its divisors is an integer number (6719378239).

Almost surely, 2^13438756477 is an apocalyptic number.

It is an amenable number.

13438756477 is a deficient number, since it is larger than the sum of its proper divisors (1).

13438756477 is an equidigital number, since it uses as much as digits as its factorization.

13438756477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11854080, while the sum is 55.

The spelling of 13438756477 in words is "thirteen billion, four hundred thirty-eight million, seven hundred fifty-six thousand, four hundred seventy-seven".