5556578621 has 4 divisors (see below), whose sum is σ = 6061722144. Its totient is φ = 5051435100.

The previous prime is 5556578609. The next prime is 5556578623. The reversal of 5556578621 is 1268756555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5556578621 - 2¹⁰ = 5556577597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5556578621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5556578623) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 252571745 + ... + 252571766.

It is an arithmetic number, because the mean of its divisors is an integer number (1515430536).

Almost surely, 2^5556578621 is an apocalyptic number.

It is an amenable number.

5556578621 is a deficient number, since it is larger than the sum of its proper divisors (505143523).

5556578621 is a wasteful number, since it uses less digits than its factorization.

5556578621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505143522.

The product of its digits is 2520000, while the sum is 50.

The square root of 5556578621 is about 74542.4618657044. The cubic root of 5556578621 is about 1771.2063255577.

The spelling of 5556578621 in words is "five billion, five hundred fifty-six million, five hundred seventy-eight thousand, six hundred twenty-one".