13878211716 has 18 divisors (see below), whose sum is σ = 35081035262. Its totient is φ = 4626070560.

The previous prime is 13878211709. The next prime is 13878211717. The reversal of 13878211716 is 61711287831.

It can be written as a sum of positive squares in only one way, i.e., 10754519616 + 3123692100 = 103704^2 + 55890^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (13878211717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192752905 + ... + 192752976.

Almost surely, 2^13878211716 is an apocalyptic number.

It is an amenable number.

13878211716 is an abundant number, since it is smaller than the sum of its proper divisors (21202823546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13878211716 is a wasteful number, since it uses less digits than its factorization.

13878211716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385505891 (or 385505886 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The spelling of 13878211716 in words is "thirteen billion, eight hundred seventy-eight million, two hundred eleven thousand, seven hundred sixteen".