2218561667 has 8 divisors (see below), whose sum is σ = 2541358176. Its totient is φ = 1897229952.

The previous prime is 2218561663. The next prime is 2218561673. The reversal of 2218561667 is 7661658122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2218561667 - 2² = 2218561663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2218561663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362948 + ... + 369009.

It is an arithmetic number, because the mean of its divisors is an integer number (317669772).

Almost surely, 2^2218561667 is an apocalyptic number.

2218561667 is a deficient number, since it is larger than the sum of its proper divisors (322796509).

2218561667 is an equidigital number, since it uses as much as digits as its factorization.

2218561667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732397.

The product of its digits is 241920, while the sum is 44.

The square root of 2218561667 is about 47101.6100255607. The cubic root of 2218561667 is about 1304.2389571354.

The spelling of 2218561667 in words is "two billion, two hundred eighteen million, five hundred sixty-one thousand, six hundred sixty-seven".