5511045661 has 4 divisors (see below), whose sum is σ = 6012049824. Its totient is φ = 5010041500.

The previous prime is 5511045643. The next prime is 5511045691. The reversal of 5511045661 is 1665401155.

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 5511045661 - 2¹⁷ = 5510914589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511045611) 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, 250502065 + ... + 250502086.

It is an arithmetic number, because the mean of its divisors is an integer number (1503012456).

Almost surely, 2^5511045661 is an apocalyptic number.

It is an amenable number.

5511045661 is a deficient number, since it is larger than the sum of its proper divisors (501004163).

5511045661 is a wasteful number, since it uses less digits than its factorization.

5511045661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501004162.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 5511045661 is about 74236.4173502466. The cubic root of 5511045661 is about 1766.3550450997.

The spelling of 5511045661 in words is "five billion, five hundred eleven million, forty-five thousand, six hundred sixty-one".