55550555561 has 8 divisors (see below), whose sum is σ = 56430630144. Its totient is φ = 54673194240.

The previous prime is 55550555551. The next prime is 55550555573. The reversal of 55550555561 is 16555505555.

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 55550555561 - 2¹⁸ = 55550293417 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 (55550555551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637025 + ... + 718958.

It is an arithmetic number, because the mean of its divisors is an integer number (7053828768).

Almost surely, 2^55550555561 is an apocalyptic number.

It is an amenable number.

55550555561 is a deficient number, since it is larger than the sum of its proper divisors (880074583).

55550555561 is a wasteful number, since it uses less digits than its factorization.

55550555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356631.

The product of its (nonzero) digits is 2343750, while the sum is 47.

The spelling of 55550555561 in words is "fifty-five billion, five hundred fifty million, five hundred fifty-five thousand, five hundred sixty-one".