65139516584 has 8 divisors (see below), whose sum is σ = 122136593610. Its totient is φ = 32569758288.

The previous prime is 65139516581. The next prime is 65139516613. The reversal of 65139516584 is 48561593156.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 62005980100 + 3133536484 = 249010^2 + 55978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×65139516584² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65139516581) 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 as a sum of consecutive naturals, namely, 4071219779 + ... + 4071219794.

Almost surely, 2^65139516584 is an apocalyptic number.

It is an amenable number.

65139516584 is a deficient number, since it is larger than the sum of its proper divisors (56997077026).

65139516584 is a wasteful number, since it uses less digits than its factorization.

65139516584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142439579 (or 8142439575 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 53.

The spelling of 65139516584 in words is "sixty-five billion, one hundred thirty-nine million, five hundred sixteen thousand, five hundred eighty-four".