55061116561 has 16 divisors (see below), whose sum is σ = 60844124160. Its totient is φ = 49408042320.

The previous prime is 55061116529. The next prime is 55061116571. The reversal of 55061116561 is 16561116055.

It is a cyclic number.

It is not a de Polignac number, because 55061116561 - 2⁵ = 55061116529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55061116561.

It is not an unprimeable number, because it can be changed into a prime (55061116511) 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, 4254246 + ... + 4267168.

It is an arithmetic number, because the mean of its divisors is an integer number (3802757760).

Almost surely, 2^55061116561 is an apocalyptic number.

It is an amenable number.

55061116561 is a deficient number, since it is larger than the sum of its proper divisors (5783007599).

55061116561 is a wasteful number, since it uses less digits than its factorization.

55061116561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17916.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 55061116561 in words is "fifty-five billion, sixty-one million, one hundred sixteen thousand, five hundred sixty-one".