65816261717 has 4 divisors (see below), whose sum is σ = 65913479916. Its totient is φ = 65719043520.

The previous prime is 65816261689. The next prime is 65816261737. The reversal of 65816261717 is 71716261856.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47089434001 + 18726827716 = 217001^2 + 136846^2 .

It is a cyclic number.

It is not a de Polignac number, because 65816261717 - 2²⁴ = 65799484501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65816261737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48608084 + ... + 48609437.

It is an arithmetic number, because the mean of its divisors is an integer number (16478369979).

Almost surely, 2^65816261717 is an apocalyptic number.

It is an amenable number.

65816261717 is a deficient number, since it is larger than the sum of its proper divisors (97218199).

65816261717 is an equidigital number, since it uses as much as digits as its factorization.

65816261717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97218198.

The product of its digits is 846720, while the sum is 50.

The spelling of 65816261717 in words is "sixty-five billion, eight hundred sixteen million, two hundred sixty-one thousand, seven hundred seventeen".