64998339839 has 4 divisors (see below), whose sum is σ = 64999420824. Its totient is φ = 64997258856.

The previous prime is 64998339821. The next prime is 64998339919. The reversal of 64998339839 is 93893389946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64998339839 is a prime.

It is a super-3 number, since 3×64998339839³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64998333839) 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, 444632 + ... + 572445.

It is an arithmetic number, because the mean of its divisors is an integer number (16249855206).

Almost surely, 2^64998339839 is an apocalyptic number.

64998339839 is a deficient number, since it is larger than the sum of its proper divisors (1080985).

64998339839 is a wasteful number, since it uses less digits than its factorization.

64998339839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080984.

The product of its digits is 272097792, while the sum is 71.

The spelling of 64998339839 in words is "sixty-four billion, nine hundred ninety-eight million, three hundred thirty-nine thousand, eight hundred thirty-nine".