13478378429665 has 16 divisors (see below), whose sum is σ = 16720815500928. Its totient is φ = 10423365474816.

The previous prime is 13478378429647. The next prime is 13478378429699. The reversal of 13478378429665 is 56692487387431.

13478378429665 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 a de Polignac number, because none of the positive numbers 2^k-13478378429665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323124157 + ... + 323165866.

It is an arithmetic number, because the mean of its divisors is an integer number (1045050968808).

Almost surely, 2^{13478378429665} is an apocalyptic number.

It is an amenable number.

13478378429665 is a deficient number, since it is larger than the sum of its proper divisors (3242437071263).

13478378429665 is an equidigital number, since it uses as much as digits as its factorization.

13478378429665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646290168.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 13478378429665 in words is "thirteen trillion, four hundred seventy-eight billion, three hundred seventy-eight million, four hundred twenty-nine thousand, six hundred sixty-five".