13628778655 has 4 divisors (see below), whose sum is σ = 16354534392. Its totient is φ = 10903022920.

The previous prime is 13628778649. The next prime is 13628778677. The reversal of 13628778655 is 55687782631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13628778655 - 2⁵ = 13628778623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13628778655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1362877861 + ... + 1362877870.

It is an arithmetic number, because the mean of its divisors is an integer number (4088633598).

Almost surely, 2^13628778655 is an apocalyptic number.

13628778655 is a deficient number, since it is larger than the sum of its proper divisors (2725755737).

13628778655 is an equidigital number, since it uses as much as digits as its factorization.

13628778655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725755736.

The product of its digits is 16934400, while the sum is 58.

The spelling of 13628778655 in words is "thirteen billion, six hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred fifty-five".