65687881879 has 8 divisors (see below), whose sum is σ = 69150158000. Its totient is φ = 62226107712.

The previous prime is 65687881801. The next prime is 65687881907. The reversal of 65687881879 is 97818878656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65687881879 - 2²⁵ = 65654327447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65687881279) 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 7 ways as a sum of consecutive naturals, for example, 159787 + ... + 396115.

It is an arithmetic number, because the mean of its divisors is an integer number (8643769750).

Almost surely, 2^65687881879 is an apocalyptic number.

65687881879 is a deficient number, since it is larger than the sum of its proper divisors (3462276121).

65687881879 is a wasteful number, since it uses less digits than its factorization.

65687881879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250977.

The product of its digits is 325140480, while the sum is 73.

The spelling of 65687881879 in words is "sixty-five billion, six hundred eighty-seven million, eight hundred eighty-one thousand, eight hundred seventy-nine".