2218994557 has 8 divisors (see below), whose sum is σ = 2390382680. Its totient is φ = 2047705920.

The previous prime is 2218994527. The next prime is 2218994563. The reversal of 2218994557 is 7554998122.

It can be written as a sum of positive squares in 4 ways, for example, as 332916516 + 1886078041 = 18246^2 + 43429^2 .

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

It is not a de Polignac number, because 2218994557 - 2²³ = 2210605949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218994527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25207 + ... + 71227.

It is an arithmetic number, because the mean of its divisors is an integer number (298797835).

Almost surely, 2^2218994557 is an apocalyptic number.

It is an amenable number.

2218994557 is a deficient number, since it is larger than the sum of its proper divisors (171388123).

2218994557 is a wasteful number, since it uses less digits than its factorization.

2218994557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49743.

The product of its digits is 1814400, while the sum is 52.

The square root of 2218994557 is about 47106.2050795859. The cubic root of 2218994557 is about 1304.3237801528.

The spelling of 2218994557 in words is "two billion, two hundred eighteen million, nine hundred ninety-four thousand, five hundred fifty-seven".