61055560055561 has 4 divisors (see below), whose sum is σ = 61055587766400. Its totient is φ = 61055532344724.

The previous prime is 61055560055557. The next prime is 61055560055569. The reversal of 61055560055561 is 16555006555016.

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 61055560055561 - 2² = 61055560055557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61055560055569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235141 + ... + 15062178.

It is an arithmetic number, because the mean of its divisors is an integer number (15263896941600).

Almost surely, 2^{61055560055561} is an apocalyptic number.

It is an amenable number.

61055560055561 is a deficient number, since it is larger than the sum of its proper divisors (27710839).

61055560055561 is a wasteful number, since it uses less digits than its factorization.

61055560055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27710838.

The product of its (nonzero) digits is 3375000, while the sum is 50.

The spelling of 61055560055561 in words is "sixty-one trillion, fifty-five billion, five hundred sixty million, fifty-five thousand, five hundred sixty-one".