13878042785 has 16 divisors (see below), whose sum is σ = 16856715600. Its totient is φ = 10967294976.

The previous prime is 13878042779. The next prime is 13878042793. The reversal of 13878042785 is 58724087831.

It can be written as a sum of positive squares in 8 ways, for example, as 2410417216 + 11467625569 = 49096^2 + 107087^2 .

It is a cyclic number.

It is not a de Polignac number, because 13878042785 - 2¹⁰ = 13878041761 is a prime.

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, 473951 + ... + 502379.

It is an arithmetic number, because the mean of its divisors is an integer number (1053544725).

Almost surely, 2^13878042785 is an apocalyptic number.

It is an amenable number.

13878042785 is a deficient number, since it is larger than the sum of its proper divisors (2978672815).

13878042785 is a wasteful number, since it uses less digits than its factorization.

13878042785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29620.

The product of its (nonzero) digits is 3010560, while the sum is 53.

The spelling of 13878042785 in words is "thirteen billion, eight hundred seventy-eight million, forty-two thousand, seven hundred eighty-five".