2188618442404 has 9 divisors (see below), whose sum is σ = 3830087452107. Its totient is φ = 1094307741804.

The previous prime is 2188618442393. The next prime is 2188618442449. The reversal of 2188618442404 is 4042448168812.

It is a happy number.

The square root of 2188618442404 is 1479398.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×2188618442404² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2588947 + ... + 3328645.

Almost surely, 2^{2188618442404} is an apocalyptic number.

2188618442404 is the 1479398-th square number.

It is an amenable number.

2188618442404 is a deficient number, since it is larger than the sum of its proper divisors (1641469009703).

2188618442404 is an frugal number, since it uses more digits than its factorization.

2188618442404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479402 (or 739701 counting only the distinct ones).

The product of its (nonzero) digits is 3145728, while the sum is 52.

The spelling of 2188618442404 in words is "two trillion, one hundred eighty-eight billion, six hundred eighteen million, four hundred forty-two thousand, four hundred four".