65561854985 has 32 divisors (see below), whose sum is σ = 91017644544. Its totient is φ = 44806144000.

The previous prime is 65561854973. The next prime is 65561854987. The reversal of 65561854985 is 58945816556.

It is not a de Polignac number, because 65561854985 - 2¹⁸ = 65561592841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65561854987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 544640 + ... + 654030.

It is an arithmetic number, because the mean of its divisors is an integer number (2844301392).

Almost surely, 2^65561854985 is an apocalyptic number.

It is an amenable number.

65561854985 is a deficient number, since it is larger than the sum of its proper divisors (25455789559).

65561854985 is a wasteful number, since it uses less digits than its factorization.

65561854985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110065.

The product of its digits is 51840000, while the sum is 62.

The spelling of 65561854985 in words is "sixty-five billion, five hundred sixty-one million, eight hundred fifty-four thousand, nine hundred eighty-five".