55116001561 has 8 divisors (see below), whose sum is σ = 56498173704. Its totient is φ = 53735633280.

The previous prime is 55116001543. The next prime is 55116001571. The reversal of 55116001561 is 16510061155.

55116001561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11256025 + 55104745536 = 3355^2 + 234744^2 .

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 55116001561 - 2¹⁵ = 55115968793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55116001571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388986 + ... + 511411.

It is an arithmetic number, because the mean of its divisors is an integer number (7062271713).

Almost surely, 2^55116001561 is an apocalyptic number.

It is an amenable number.

55116001561 is a deficient number, since it is larger than the sum of its proper divisors (1382172143).

55116001561 is a wasteful number, since it uses less digits than its factorization.

55116001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901931.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 55116001561 in words is "fifty-five billion, one hundred sixteen million, one thousand, five hundred sixty-one".