65407647517 has 4 divisors (see below), whose sum is σ = 65409971580. Its totient is φ = 65405323456.

The previous prime is 65407647511. The next prime is 65407647527. The reversal of 65407647517 is 71574670456.

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 54093921561 + 11313725956 = 232581^2 + 106366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65407647517 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 (65407647511) 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 3 ways as a sum of consecutive naturals, for example, 1119292 + ... + 1176277.

It is an arithmetic number, because the mean of its divisors is an integer number (16352492895).

Almost surely, 2^65407647517 is an apocalyptic number.

It is an amenable number.

65407647517 is a deficient number, since it is larger than the sum of its proper divisors (2324063).

65407647517 is a wasteful number, since it uses less digits than its factorization.

65407647517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324062.

The product of its (nonzero) digits is 4939200, while the sum is 52.

The spelling of 65407647517 in words is "sixty-five billion, four hundred seven million, six hundred forty-seven thousand, five hundred seventeen".