6642220255 has 32 divisors (see below), whose sum is σ = 9109075968. Its totient is φ = 4602470400.

The previous prime is 6642220237. The next prime is 6642220259. The reversal of 6642220255 is 5520222466.

It is a de Polignac number, because none of the positive numbers 2^k-6642220255 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 6642220255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642220259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314890 + ... + 335320.

It is an arithmetic number, because the mean of its divisors is an integer number (284658624).

Almost surely, 2^6642220255 is an apocalyptic number.

6642220255 is a deficient number, since it is larger than the sum of its proper divisors (2466855713).

6642220255 is a wasteful number, since it uses less digits than its factorization.

6642220255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20727.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 6642220255 is about 81499.8175151331. The cubic root of 6642220255 is about 1879.7687446611.

The spelling of 6642220255 in words is "six billion, six hundred forty-two million, two hundred twenty thousand, two hundred fifty-five".