13578565381 has 2 divisors, whose sum is σ = 13578565382. Its totient is φ = 13578565380.

The previous prime is 13578565379. The next prime is 13578565421. The reversal of 13578565381 is 18356587531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9151792225 + 4426773156 = 95665^2 + 66534^2 .

It is a cyclic number.

It is not a de Polignac number, because 13578565381 - 2¹ = 13578565379 is a prime.

It is a super-2 number, since 2×13578565381² (a number of 21 digits) contains 22 as substring.

Together with 13578565379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13578565181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6789282690 + 6789282691.

It is an arithmetic number, because the mean of its divisors is an integer number (6789282691).

Almost surely, 2^13578565381 is an apocalyptic number.

It is an amenable number.

13578565381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13578565381 is an equidigital number, since it uses as much as digits as its factorization.

13578565381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024000, while the sum is 52.

The spelling of 13578565381 in words is "thirteen billion, five hundred seventy-eight million, five hundred sixty-five thousand, three hundred eighty-one".