13709321965987 has 16 divisors (see below), whose sum is σ = 13923030159360. Its totient is φ = 13495884418368.

The previous prime is 13709321965961. The next prime is 13709321965991. The reversal of 13709321965987 is 78956912390731.

It is a happy number.

13709321965987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13709321965987 - 2²⁷ = 13709187748259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13709321945987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772913383 + ... + 772931119.

It is an arithmetic number, because the mean of its divisors is an integer number (870189384960).

Almost surely, 2^{13709321965987} is an apocalyptic number.

13709321965987 is a deficient number, since it is larger than the sum of its proper divisors (213708193373).

13709321965987 is a wasteful number, since it uses less digits than its factorization.

13709321965987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24690.

The product of its (nonzero) digits is 154314720, while the sum is 70.

The spelling of 13709321965987 in words is "thirteen trillion, seven hundred nine billion, three hundred twenty-one million, nine hundred sixty-five thousand, nine hundred eighty-seven".