13128837778 has 32 divisors (see below), whose sum is σ = 24195225600. Its totient is φ = 5217085584.

The previous prime is 13128837773. The next prime is 13128837791. The reversal of 13128837778 is 87773882131.

It is not an unprimeable number, because it can be changed into a prime (13128837773) 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, 512568 + ... + 537571.

It is an arithmetic number, because the mean of its divisors is an integer number (756100800).

Almost surely, 2^13128837778 is an apocalyptic number.

13128837778 is a deficient number, since it is larger than the sum of its proper divisors (11066387822).

13128837778 is a wasteful number, since it uses less digits than its factorization.

13128837778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050214.

The product of its digits is 3161088, while the sum is 55.

The spelling of 13128837778 in words is "thirteen billion, one hundred twenty-eight million, eight hundred thirty-seven thousand, seven hundred seventy-eight".