5561215561 has 8 divisors (see below), whose sum is σ = 6120470304. Its totient is φ = 5010909120.

The previous prime is 5561215531. The next prime is 5561215567. The reversal of 5561215561 is 1655121655.

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 5561215561 - 2⁵ = 5561215529 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 5561215561.

It is not an unprimeable number, because it can be changed into a prime (5561215567) 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 7 ways as a sum of consecutive naturals, for example, 2235771 + ... + 2238256.

It is an arithmetic number, because the mean of its divisors is an integer number (765058788).

Almost surely, 2^5561215561 is an apocalyptic number.

It is an amenable number.

5561215561 is a deficient number, since it is larger than the sum of its proper divisors (559254743).

5561215561 is a wasteful number, since it uses less digits than its factorization.

5561215561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474151.

The product of its digits is 45000, while the sum is 37.

The square root of 5561215561 is about 74573.5580551176. The cubic root of 5561215561 is about 1771.6988764908.

It can be divided in two parts, 5561 and 215561, that added together give a palindrome (221122).

The spelling of 5561215561 in words is "five billion, five hundred sixty-one million, two hundred fifteen thousand, five hundred sixty-one".