13781638079 has 4 divisors (see below), whose sum is σ = 15034514280. Its totient is φ = 12528761880.

The previous prime is 13781638069. The next prime is 13781638127. The reversal of 13781638079 is 97083618731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97083618731 = 11 ⋅8825783521.

It is a cyclic number.

It is not a de Polignac number, because 13781638079 - 2⁸ = 13781637823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13781638079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781638009) 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, 626438084 + ... + 626438105.

It is an arithmetic number, because the mean of its divisors is an integer number (3758628570).

Almost surely, 2^13781638079 is an apocalyptic number.

13781638079 is a deficient number, since it is larger than the sum of its proper divisors (1252876201).

13781638079 is a wasteful number, since it uses less digits than its factorization.

13781638079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252876200.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 13781638079 in words is "thirteen billion, seven hundred eighty-one million, six hundred thirty-eight thousand, seventy-nine".