65876778656 has 144 divisors (see below), whose sum is σ = 146499833088. Its totient is φ = 29113344000.

The previous prime is 65876778629. The next prime is 65876778677. The reversal of 65876778656 is 65687767856.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65876778656.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16259831 + ... + 16263881.

It is an arithmetic number, because the mean of its divisors is an integer number (1017359952).

Almost surely, 2^65876778656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65876778656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73249916544).

65876778656 is an abundant number, since it is smaller than the sum of its proper divisors (80623054432).

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

65876778656 is a wasteful number, since it uses less digits than its factorization.

65876778656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215 (or 4194 counting only the distinct ones).

The product of its digits is 711244800, while the sum is 71.

The spelling of 65876778656 in words is "sixty-five billion, eight hundred seventy-six million, seven hundred seventy-eight thousand, six hundred fifty-six".