2221566555 has 32 divisors (see below), whose sum is σ = 3830379840. Its totient is φ = 1092994560.

The previous prime is 2221566541. The next prime is 2221566559. The reversal of 2221566555 is 5556651222.

It is not a de Polignac number, because 2221566555 - 2⁹ = 2221566043 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (2221566559) 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, 439945 + ... + 444965.

It is an arithmetic number, because the mean of its divisors is an integer number (119699370).

Almost surely, 2^2221566555 is an apocalyptic number.

2221566555 is a deficient number, since it is larger than the sum of its proper divisors (1608813285).

2221566555 is a wasteful number, since it uses less digits than its factorization.

2221566555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7311.

The product of its digits is 180000, while the sum is 39.

The square root of 2221566555 is about 47133.4971649675. The cubic root of 2221566555 is about 1304.8275252455.

The spelling of 2221566555 in words is "two billion, two hundred twenty-one million, five hundred sixty-six thousand, five hundred fifty-five".