13778678569 has 2 divisors, whose sum is σ = 13778678570. Its totient is φ = 13778678568.

The previous prime is 13778678567. The next prime is 13778678629. The reversal of 13778678569 is 96587687731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8315251344 + 5463427225 = 91188^2 + 73915^2 .

It is a cyclic number.

It is not a de Polignac number, because 13778678569 - 2¹ = 13778678567 is a prime.

It is a super-2 number, since 2×13778678569² (a number of 21 digits) contains 22 as substring.

Together with 13778678567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13778678567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6889339284 + 6889339285.

It is an arithmetic number, because the mean of its divisors is an integer number (6889339285).

Almost surely, 2^13778678569 is an apocalyptic number.

It is an amenable number.

13778678569 is a deficient number, since it is larger than the sum of its proper divisors (1).

13778678569 is an equidigital number, since it uses as much as digits as its factorization.

13778678569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 67.

The spelling of 13778678569 in words is "thirteen billion, seven hundred seventy-eight million, six hundred seventy-eight thousand, five hundred sixty-nine".