13778423066805 has 16 divisors (see below), whose sum is σ = 22149957845184. Its totient is φ = 7313665322880.

The previous prime is 13778423066761. The next prime is 13778423066867. The reversal of 13778423066805 is 50866032487731.

It is a happy number.

It is not a de Polignac number, because 13778423066805 - 2²¹ = 13778420969653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2176682944 + ... + 2176689273.

It is an arithmetic number, because the mean of its divisors is an integer number (1384372365324).

Almost surely, 2^{13778423066805} is an apocalyptic number.

13778423066805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13778423066805 is a deficient number, since it is larger than the sum of its proper divisors (8371534778379).

13778423066805 is a wasteful number, since it uses less digits than its factorization.

13778423066805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353372436.

The product of its (nonzero) digits is 40642560, while the sum is 60.

The spelling of 13778423066805 in words is "thirteen trillion, seven hundred seventy-eight billion, four hundred twenty-three million, sixty-six thousand, eight hundred five".