65561105 has 4 divisors (see below), whose sum is σ = 78673332. Its totient is φ = 52448880.

The previous prime is 65561101. The next prime is 65561107. The reversal of 65561105 is 50116556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48330304 + 17230801 = 6952^2 + 4151^2 .

It is not a de Polignac number, because 65561105 - 2² = 65561101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65561101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6556106 + ... + 6556115.

It is an arithmetic number, because the mean of its divisors is an integer number (19668333).

Almost surely, 2^65561105 is an apocalyptic number.

It is an amenable number.

65561105 is a deficient number, since it is larger than the sum of its proper divisors (13112227).

65561105 is a wasteful number, since it uses less digits than its factorization.

65561105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13112226.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 65561105 is about 8096.9812275934. The cubic root of 65561105 is about 403.2262110313.

It can be divided in two parts, 65561 and 105, that multiplied together give a triangular number (6883905 = T₃₇₁₀).

The spelling of 65561105 in words is "sixty-five million, five hundred sixty-one thousand, one hundred five".