65781885565 has 32 divisors (see below), whose sum is σ = 86490892800. Its totient is φ = 47632704000.

The previous prime is 65781885523. The next prime is 65781885569. The reversal of 65781885565 is 56558818756.

It is not a de Polignac number, because 65781885565 - 2⁷ = 65781885437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65781885497 and 65781885506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65781885569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14147361 + ... + 14152009.

It is an arithmetic number, because the mean of its divisors is an integer number (2702840400).

Almost surely, 2^65781885565 is an apocalyptic number.

It is an amenable number.

65781885565 is a deficient number, since it is larger than the sum of its proper divisors (20709007235).

65781885565 is a wasteful number, since it uses less digits than its factorization.

65781885565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5733.

The product of its digits is 80640000, while the sum is 64.

The spelling of 65781885565 in words is "sixty-five billion, seven hundred eighty-one million, eight hundred eighty-five thousand, five hundred sixty-five".