5521221561 has 4 divisors (see below), whose sum is σ = 7361628752. Its totient is φ = 3680814372.

The previous prime is 5521221547. The next prime is 5521221583. The reversal of 5521221561 is 1651221255.

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 not a de Polignac number, because 5521221561 - 2²³ = 5512832953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5521222561) 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, 920203591 + ... + 920203596.

It is an arithmetic number, because the mean of its divisors is an integer number (1840407188).

Almost surely, 2^5521221561 is an apocalyptic number.

It is an amenable number.

5521221561 is a deficient number, since it is larger than the sum of its proper divisors (1840407191).

5521221561 is a wasteful number, since it uses less digits than its factorization.

5521221561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840407190.

The product of its digits is 6000, while the sum is 30.

The square root of 5521221561 is about 74304.9228584486. The cubic root of 5521221561 is about 1767.4415419195.

The spelling of 5521221561 in words is "five billion, five hundred twenty-one million, two hundred twenty-one thousand, five hundred sixty-one".