2551166444 has 6 divisors (see below), whose sum is σ = 4464541284. Its totient is φ = 1275583220.

The previous prime is 2551166441. The next prime is 2551166459. The reversal of 2551166444 is 4446611552.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2551166398 and 2551166407.

It is not an unprimeable number, because it can be changed into a prime (2551166441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318895802 + ... + 318895809.

It is an arithmetic number, because the mean of its divisors is an integer number (744090214).

Almost surely, 2^2551166444 is an apocalyptic number.

It is an amenable number.

2551166444 is a deficient number, since it is larger than the sum of its proper divisors (1913374840).

2551166444 is a wasteful number, since it uses less digits than its factorization.

2551166444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637791615 (or 637791613 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The square root of 2551166444 is about 50509.0728879476. The cubic root of 2551166444 is about 1366.4054890424.

Adding to 2551166444 its reverse (4446611552), we get a palindrome (6997777996).

The spelling of 2551166444 in words is "two billion, five hundred fifty-one million, one hundred sixty-six thousand, four hundred forty-four".