13778855761 has 12 divisors (see below), whose sum is σ = 15358678272. Its totient is φ = 12349799000.

The previous prime is 13778855749. The next prime is 13778855791. The reversal of 13778855761 is 16755887731.

It is not a de Polignac number, because 13778855761 - 2⁷ = 13778855633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13778855696 and 13778855705.

It is not an unprimeable number, because it can be changed into a prime (13778855791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793345 + ... + 810526.

It is an arithmetic number, because the mean of its divisors is an integer number (1279889856).

Almost surely, 2^13778855761 is an apocalyptic number.

13778855761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13778855761 is a deficient number, since it is larger than the sum of its proper divisors (1579822511).

13778855761 is a wasteful number, since it uses less digits than its factorization.

13778855761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603964 (or 1603953 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 58.

The spelling of 13778855761 in words is "thirteen billion, seven hundred seventy-eight million, eight hundred fifty-five thousand, seven hundred sixty-one".