5561221511 has 32 divisors (see below), whose sum is σ = 6168960000. Its totient is φ = 4992624000.

The previous prime is 5561221507. The next prime is 5561221537. The reversal of 5561221511 is 1151221655.

It is a cyclic number.

It is not a de Polignac number, because 5561221511 - 2² = 5561221507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561211511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10925525 + ... + 10926033.

It is an arithmetic number, because the mean of its divisors is an integer number (192780000).

Almost surely, 2^5561221511 is an apocalyptic number.

5561221511 is a deficient number, since it is larger than the sum of its proper divisors (607738489).

5561221511 is a wasteful number, since it uses less digits than its factorization.

5561221511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887.

The product of its digits is 3000, while the sum is 29.

The square root of 5561221511 is about 74573.5979486038. The cubic root of 5561221511 is about 1771.6995083433.

The spelling of 5561221511 in words is "five billion, five hundred sixty-one million, two hundred twenty-one thousand, five hundred eleven".