13078778137 has 2 divisors, whose sum is σ = 13078778138. Its totient is φ = 13078778136.

The previous prime is 13078778123. The next prime is 13078778161. The reversal of 13078778137 is 73187787031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9734584896 + 3344193241 = 98664^2 + 57829^2 .

It is a cyclic number.

It is not a de Polignac number, because 13078778137 - 2¹⁹ = 13078253849 is a prime.

It is not a weakly prime, because it can be changed into another prime (13078778197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6539389068 + 6539389069.

It is an arithmetic number, because the mean of its divisors is an integer number (6539389069).

Almost surely, 2^13078778137 is an apocalyptic number.

It is an amenable number.

13078778137 is a deficient number, since it is larger than the sum of its proper divisors (1).

13078778137 is an equidigital number, since it uses as much as digits as its factorization.

13078778137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382976, while the sum is 52.

The spelling of 13078778137 in words is "thirteen billion, seventy-eight million, seven hundred seventy-eight thousand, one hundred thirty-seven".