65561205 has 8 divisors (see below), whose sum is σ = 104897952. Its totient is φ = 34965968.

The previous prime is 65561189. The next prime is 65561207. The reversal of 65561205 is 50216556.

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 65561205 - 2⁴ = 65561189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561207) 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, 2185359 + ... + 2185388.

It is an arithmetic number, because the mean of its divisors is an integer number (13112244).

Almost surely, 2^65561205 is an apocalyptic number.

It is an amenable number.

65561205 is a deficient number, since it is larger than the sum of its proper divisors (39336747).

65561205 is a wasteful number, since it uses less digits than its factorization.

65561205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370755.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 65561205 is about 8096.9874027320. The cubic root of 65561205 is about 403.2264160442.

It can be divided in two parts, 65 and 561205, that added together give a triangular number (561270 = T₁₀₅₉).

The spelling of 65561205 in words is "sixty-five million, five hundred sixty-one thousand, two hundred five".