5515544421 has 20 divisors (see below), whose sum is σ = 8374347564. Its totient is φ = 3616747200.

The previous prime is 5515544389. The next prime is 5515544429. The reversal of 5515544421 is 1244455155.

It can be written as a sum of positive squares in 2 ways, for example, as 1494209025 + 4021335396 = 38655^2 + 63414^2 .

It is not a de Polignac number, because 5515544421 - 2⁵ = 5515544389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515544429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 553200 + ... + 563081.

Almost surely, 2^5515544421 is an apocalyptic number.

It is an amenable number.

5515544421 is a deficient number, since it is larger than the sum of its proper divisors (2858803143).

5515544421 is a wasteful number, since it uses less digits than its factorization.

5515544421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116354 (or 1116345 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The square root of 5515544421 is about 74266.7113921170. The cubic root of 5515544421 is about 1766.8355495647.

Adding to 5515544421 its reverse (1244455155), we get a palindrome (6759999576).

The spelling of 5515544421 in words is "five billion, five hundred fifteen million, five hundred forty-four thousand, four hundred twenty-one".