13978966511 has 4 divisors (see below), whose sum is σ = 14002781352. Its totient is φ = 13955151672.

The previous prime is 13978966459. The next prime is 13978966513. The reversal of 13978966511 is 11566987931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13978966511 - 2³⁰ = 12905224687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978966513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11906540 + ... + 11907713.

It is an arithmetic number, because the mean of its divisors is an integer number (3500695338).

Almost surely, 2^13978966511 is an apocalyptic number.

13978966511 is a deficient number, since it is larger than the sum of its proper divisors (23814841).

13978966511 is an equidigital number, since it uses as much as digits as its factorization.

13978966511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23814840.

The product of its digits is 2449440, while the sum is 56.

The spelling of 13978966511 in words is "thirteen billion, nine hundred seventy-eight million, nine hundred sixty-six thousand, five hundred eleven".