65841923857 has 4 divisors (see below), whose sum is σ = 65933498880. Its totient is φ = 65750348836.

The previous prime is 65841923813. The next prime is 65841923867. The reversal of 65841923857 is 75832914856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65841923857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65841923867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45786433 + ... + 45787870.

It is an arithmetic number, because the mean of its divisors is an integer number (16483374720).

Almost surely, 2^65841923857 is an apocalyptic number.

It is an amenable number.

65841923857 is a deficient number, since it is larger than the sum of its proper divisors (91575023).

65841923857 is an equidigital number, since it uses as much as digits as its factorization.

65841923857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91575022.

The product of its digits is 14515200, while the sum is 58.

Subtracting 65841923857 from its reverse (75832914856), we obtain a palindrome (9990990999).

It can be divided in two parts, 658419 and 23857, that added together give a square (682276 = 826²).

The spelling of 65841923857 in words is "sixty-five billion, eight hundred forty-one million, nine hundred twenty-three thousand, eight hundred fifty-seven".