5561571621 has 8 divisors (see below), whose sum is σ = 7504771680. Its totient is φ = 3663042992.

The previous prime is 5561571619. The next prime is 5561571671. The reversal of 5561571621 is 1261751655.

It is a happy number.

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 5561571621 - 2¹ = 5561571619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5561571621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561571601) 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 7 ways as a sum of consecutive naturals, for example, 11167566 + ... + 11168063.

It is an arithmetic number, because the mean of its divisors is an integer number (938096460).

Almost surely, 2^5561571621 is an apocalyptic number.

It is an amenable number.

5561571621 is a deficient number, since it is larger than the sum of its proper divisors (1943200059).

5561571621 is a wasteful number, since it uses less digits than its factorization.

5561571621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22335715.

The product of its digits is 63000, while the sum is 39.

The square root of 5561571621 is about 74575.9453242130. The cubic root of 5561571621 is about 1771.7366870277.

The spelling of 5561571621 in words is "five billion, five hundred sixty-one million, five hundred seventy-one thousand, six hundred twenty-one".