65340721117 has 4 divisors (see below), whose sum is σ = 74675109856. Its totient is φ = 56006332380.

The previous prime is 65340721013. The next prime is 65340721141. The reversal of 65340721117 is 71112704356.

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 not a de Polignac number, because 65340721117 - 2²³ = 65332332509 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 (65340725117) 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, 4667194359 + ... + 4667194372.

It is an arithmetic number, because the mean of its divisors is an integer number (18668777464).

Almost surely, 2^65340721117 is an apocalyptic number.

It is an amenable number.

65340721117 is a deficient number, since it is larger than the sum of its proper divisors (9334388739).

65340721117 is an equidigital number, since it uses as much as digits as its factorization.

65340721117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9334388738.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 65340721117 in words is "sixty-five billion, three hundred forty million, seven hundred twenty-one thousand, one hundred seventeen".