5551111440 has 720 divisors, whose sum is σ = 23525244288. Its totient is φ = 1191407616.

The previous prime is 5551111429. The next prime is 5551111451. The reversal of 5551111440 is 441111555.

5551111440 is a `hidden beast` number, since 5 + 5 + 511 + 1 + 144 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (5551111429) and next prime (5551111451).

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 in 143 ways as a sum of consecutive naturals, for example, 49124824 + ... + 49124936.

Almost surely, 2^5551111440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5551111440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11762622144).

5551111440 is an abundant number, since it is smaller than the sum of its proper divisors (17974132848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5551111440 is a wasteful number, since it uses less digits than its factorization.

5551111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 5551111440 is about 74505.7812521955. The cubic root of 5551111440 is about 1770.6252315745.

Adding to 5551111440 its reverse (441111555), we get a palindrome (5992222995).

The spelling of 5551111440 in words is "five billion, five hundred fifty-one million, one hundred eleven thousand, four hundred forty".