5551550561 has 16 divisors (see below), whose sum is σ = 5817398400. Its totient is φ = 5292967680.

The previous prime is 5551550551. The next prime is 5551550567. The reversal of 5551550561 is 1650551555.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5551550561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5551550567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447401 + ... + 459641.

It is an arithmetic number, because the mean of its divisors is an integer number (363587400).

Almost surely, 2^5551550561 is an apocalyptic number.

It is an amenable number.

5551550561 is a deficient number, since it is larger than the sum of its proper divisors (265847839).

5551550561 is a wasteful number, since it uses less digits than its factorization.

5551550561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12536.

The product of its (nonzero) digits is 93750, while the sum is 38.

The square root of 5551550561 is about 74508.7280860437. The cubic root of 5551550561 is about 1770.6719188148.

The spelling of 5551550561 in words is "five billion, five hundred fifty-one million, five hundred fifty thousand, five hundred sixty-one".