61055505561 has 8 divisors (see below), whose sum is σ = 81408492640. Its totient is φ = 40703094432.

The previous prime is 61055505551. The next prime is 61055505587. The reversal of 61055505561 is 16550555016.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61055505561 - 2¹¹ = 61055503513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61055505551) 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 7 ways as a sum of consecutive naturals, for example, 291726 + ... + 455208.

It is an arithmetic number, because the mean of its divisors is an integer number (10176061580).

Almost surely, 2^61055505561 is an apocalyptic number.

It is an amenable number.

61055505561 is a deficient number, since it is larger than the sum of its proper divisors (20352987079).

61055505561 is a wasteful number, since it uses less digits than its factorization.

61055505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287975.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 61055505561 in words is "sixty-one billion, fifty-five million, five hundred five thousand, five hundred sixty-one".