65508042138 has 48 divisors (see below), whose sum is σ = 164582201280. Its totient is φ = 17015074560.

The previous prime is 65508042137. The next prime is 65508042139. The reversal of 65508042138 is 83124080556.

It is an interprime number because it is at equal distance from previous prime (65508042137) and next prime (65508042139).

It is a super-2 number, since 2×65508042138² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 65508042138.

It is not an unprimeable number, because it can be changed into a prime (65508042137) 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 23 ways as a sum of consecutive naturals, for example, 6440023 + ... + 6450186.

It is an arithmetic number, because the mean of its divisors is an integer number (3428795860).

Almost surely, 2^65508042138 is an apocalyptic number.

65508042138 is an abundant number, since it is smaller than the sum of its proper divisors (99074159142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65508042138 is a wasteful number, since it uses less digits than its factorization.

65508042138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890243 (or 12890232 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 65508042138 in words is "sixty-five billion, five hundred eight million, forty-two thousand, one hundred thirty-eight".