65817477471856 has 160 divisors (see below), whose sum is σ = 144498207522816. Its totient is φ = 28771324512000.

The previous prime is 65817477471853. The next prime is 65817477471881.

65817477471856 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65817477471853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5269185771 + ... + 5269198261.

Almost surely, 2^{65817477471856} 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 65817477471856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72249103761408).

65817477471856 is an abundant number, since it is smaller than the sum of its proper divisors (78680730050960).

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

65817477471856 is a wasteful number, since it uses less digits than its factorization.

65817477471856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18491 (or 18485 counting only the distinct ones).

The product of its digits is 2212761600, while the sum is 76.

The spelling of 65817477471856 in words is "sixty-five trillion, eight hundred seventeen billion, four hundred seventy-seven million, four hundred seventy-one thousand, eight hundred fifty-six".