13220767755 has 120 divisors (see below), whose sum is σ = 25779766320. Its totient is φ = 6479066880.

The previous prime is 13220767741. The next prime is 13220767801. The reversal of 13220767755 is 55776702231.

It is not a de Polignac number, because 13220767755 - 2⁸ = 13220767499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13220767755.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 28678225 + ... + 28678685.

It is an arithmetic number, because the mean of its divisors is an integer number (214831386).

Almost surely, 2^13220767755 is an apocalyptic number.

13220767755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13220767755 is a deficient number, since it is larger than the sum of its proper divisors (12558998565).

13220767755 is a wasteful number, since it uses less digits than its factorization.

13220767755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 45.

The spelling of 13220767755 in words is "thirteen billion, two hundred twenty million, seven hundred sixty-seven thousand, seven hundred fifty-five".