64686711959 has 4 divisors (see below), whose sum is σ = 64692866160. Its totient is φ = 64680557760.

The previous prime is 64686711949. The next prime is 64686711979. The reversal of 64686711959 is 95911768646.

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-64686711959 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 (64686711919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3061307 + ... + 3082364.

It is an arithmetic number, because the mean of its divisors is an integer number (16173216540).

Almost surely, 2^64686711959 is an apocalyptic number.

64686711959 is a deficient number, since it is larger than the sum of its proper divisors (6154201).

64686711959 is a wasteful number, since it uses less digits than its factorization.

64686711959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6154200.

The product of its digits is 19595520, while the sum is 62.

The spelling of 64686711959 in words is "sixty-four billion, six hundred eighty-six million, seven hundred eleven thousand, nine hundred fifty-nine".