13509780079 has 4 divisors (see below), whose sum is σ = 13510349776. Its totient is φ = 13509210384.

The previous prime is 13509780073. The next prime is 13509780101. The reversal of 13509780079 is 97008790531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97008790531 = 17 ⋅5706399443.

It is a cyclic number.

It is not a de Polignac number, because 13509780079 - 2³¹ = 11362296431 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 (13509780073) 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, 247659 + ... + 297244.

It is an arithmetic number, because the mean of its divisors is an integer number (3377587444).

Almost surely, 2^13509780079 is an apocalyptic number.

13509780079 is a deficient number, since it is larger than the sum of its proper divisors (569697).

13509780079 is an equidigital number, since it uses as much as digits as its factorization.

13509780079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569696.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 13509780079 in words is "thirteen billion, five hundred nine million, seven hundred eighty thousand, seventy-nine".