13988978811 has 12 divisors (see below), whose sum is σ = 20858119360. Its totient is φ = 9025147440.

The previous prime is 13988978797. The next prime is 13988978821. The reversal of 13988978811 is 11887988931.

It is not a de Polignac number, because 13988978811 - 2⁶ = 13988978747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13988978821) 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, 25069576 + ... + 25070133.

Almost surely, 2^13988978811 is an apocalyptic number.

13988978811 is a deficient number, since it is larger than the sum of its proper divisors (6869140549).

13988978811 is a wasteful number, since it uses less digits than its factorization.

13988978811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50139746 (or 50139743 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 63.

The spelling of 13988978811 in words is "thirteen billion, nine hundred eighty-eight million, nine hundred seventy-eight thousand, eight hundred eleven".