55610516561 has 16 divisors (see below), whose sum is σ = 58856878080. Its totient is φ = 52459943760.

The previous prime is 55610516557. The next prime is 55610516573. The reversal of 55610516561 is 16561501655.

It is a cyclic number.

It is not a de Polignac number, because 55610516561 - 2² = 55610516557 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 (55610516461) 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, 629030 + ... + 711968.

It is an arithmetic number, because the mean of its divisors is an integer number (3678554880).

Almost surely, 2^55610516561 is an apocalyptic number.

It is an amenable number.

55610516561 is a deficient number, since it is larger than the sum of its proper divisors (3246361519).

55610516561 is a wasteful number, since it uses less digits than its factorization.

55610516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83516.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 55610516561 in words is "fifty-five billion, six hundred ten million, five hundred sixteen thousand, five hundred sixty-one".