65105561 has 8 divisors (see below), whose sum is σ = 66138240. Its totient is φ = 64076832.

The previous prime is 65105543. The next prime is 65105587. The reversal of 65105561 is 16550156.

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 65105561 - 2¹⁴ = 65089177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65105501) 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, 60716 + ... + 61778.

It is an arithmetic number, because the mean of its divisors is an integer number (8267280).

Almost surely, 2^65105561 is an apocalyptic number.

It is an amenable number.

65105561 is a deficient number, since it is larger than the sum of its proper divisors (1032679).

65105561 is a wasteful number, since it uses less digits than its factorization.

65105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975.

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

The square root of 65105561 is about 8068.8017078126. The cubic root of 65105561 is about 402.2901154884.

The spelling of 65105561 in words is "sixty-five million, one hundred five thousand, five hundred sixty-one".