5531555551 has 4 divisors (see below), whose sum is σ = 5541668632. Its totient is φ = 5521442472.

The previous prime is 5531555503. The next prime is 5531555581. The reversal of 5531555551 is 1555551355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555551355 = 5 ⋅311110271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5531555551 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 (5531555581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055720 + ... + 5056813.

It is an arithmetic number, because the mean of its divisors is an integer number (1385417158).

Almost surely, 2^5531555551 is an apocalyptic number.

5531555551 is a deficient number, since it is larger than the sum of its proper divisors (10113081).

5531555551 is a wasteful number, since it uses less digits than its factorization.

5531555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10113080.

The product of its digits is 234375, while the sum is 40.

The square root of 5531555551 is about 74374.4280717506. The cubic root of 5531555551 is about 1768.5435528652.

The spelling of 5531555551 in words is "five billion, five hundred thirty-one million, five hundred fifty-five thousand, five hundred fifty-one".