13778394911 has 2 divisors, whose sum is σ = 13778394912. Its totient is φ = 13778394910.

The previous prime is 13778394907. The next prime is 13778394941. The reversal of 13778394911 is 11949387731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13778394911 - 2² = 13778394907 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13778394941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6889197455 + 6889197456.

It is an arithmetic number, because the mean of its divisors is an integer number (6889197456).

Almost surely, 2^13778394911 is an apocalyptic number.

13778394911 is a deficient number, since it is larger than the sum of its proper divisors (1).

13778394911 is an equidigital number, since it uses as much as digits as its factorization.

13778394911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The spelling of 13778394911 in words is "thirteen billion, seven hundred seventy-eight million, three hundred ninety-four thousand, nine hundred eleven".