5581566123 has 16 divisors (see below), whose sum is σ = 9005552640. Its totient is φ = 3001850496.

The previous prime is 5581566077. The next prime is 5581566139. The reversal of 5581566123 is 3216651855.

It is a happy number.

It is not a de Polignac number, because 5581566123 - 2⁶ = 5581566059 is a prime.

It is a super-2 number, since 2×5581566123² = 62307760770842502258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5581516123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7816963 + ... + 7817676.

It is an arithmetic number, because the mean of its divisors is an integer number (562847040).

Almost surely, 2^5581566123 is an apocalyptic number.

5581566123 is a deficient number, since it is larger than the sum of its proper divisors (3423986517).

5581566123 is a wasteful number, since it uses less digits than its factorization.

5581566123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15634666.

The product of its digits is 216000, while the sum is 42.

The square root of 5581566123 is about 74709.8796880306. The cubic root of 5581566123 is about 1773.8573480804.

The spelling of 5581566123 in words is "five billion, five hundred eighty-one million, five hundred sixty-six thousand, one hundred twenty-three".