8220755655 has 24 divisors (see below), whose sum is σ = 16284926112. Its totient is φ = 3758059584.

The previous prime is 8220755617. The next prime is 8220755659. The reversal of 8220755655 is 5565570228.

8220755655 is a `hidden beast` number, since 82 + 2 + 0 + 7 + 5 + 565 + 5 = 666.

It is not a de Polignac number, because 8220755655 - 2³⁰ = 7147013831 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 8220755655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220755659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13048504 + ... + 13049133.

It is an arithmetic number, because the mean of its divisors is an integer number (678538588).

Almost surely, 2^8220755655 is an apocalyptic number.

8220755655 is a deficient number, since it is larger than the sum of its proper divisors (8064170457).

8220755655 is a wasteful number, since it uses less digits than its factorization.

8220755655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26097655 (or 26097652 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The square root of 8220755655 is about 90668.3828851050. The cubic root of 8220755655 is about 2018.2296398595.

The spelling of 8220755655 in words is "eight billion, two hundred twenty million, seven hundred fifty-five thousand, six hundred fifty-five".