13780885709 has 4 divisors (see below), whose sum is σ = 13804363104. Its totient is φ = 13757408316.

The previous prime is 13780885691. The next prime is 13780885751. The reversal of 13780885709 is 90758808731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90758808731 = 977 ⋅92895403.

It is a cyclic number.

It is not a de Polignac number, because 13780885709 - 2²⁰ = 13779837133 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 (13780885409) 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, 11737817 + ... + 11738990.

It is an arithmetic number, because the mean of its divisors is an integer number (3451090776).

Almost surely, 2^13780885709 is an apocalyptic number.

It is an amenable number.

13780885709 is a deficient number, since it is larger than the sum of its proper divisors (23477395).

13780885709 is an equidigital number, since it uses as much as digits as its factorization.

13780885709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23477394.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 13780885709 in words is "thirteen billion, seven hundred eighty million, eight hundred eighty-five thousand, seven hundred nine".