5559123721 has 8 divisors (see below), whose sum is σ = 5987796320. Its totient is φ = 5144059872.

The previous prime is 5559123679. The next prime is 5559123727. The reversal of 5559123721 is 1273219555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5559123721 - 2⁹ = 5559123209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5559123727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3401340 + ... + 3402973.

It is an arithmetic number, because the mean of its divisors is an integer number (748474540).

Almost surely, 2^5559123721 is an apocalyptic number.

It is an amenable number.

5559123721 is a deficient number, since it is larger than the sum of its proper divisors (428672599).

5559123721 is a wasteful number, since it uses less digits than its factorization.

5559123721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6804375.

The product of its digits is 94500, while the sum is 40.

The square root of 5559123721 is about 74559.5313893536. The cubic root of 5559123721 is about 1771.4767083145.

The spelling of 5559123721 in words is "five billion, five hundred fifty-nine million, one hundred twenty-three thousand, seven hundred twenty-one".