65981347776 has 84 divisors (see below), whose sum is σ = 189249678904. Its totient is φ = 21979123200.

The previous prime is 65981347769. The next prime is 65981347793. The reversal of 65981347776 is 67774318956.

65981347776 is a `hidden beast` number, since 6 + 5 + 98 + 1 + 3 + 477 + 76 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 844446 + ... + 919266.

Almost surely, 2^65981347776 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 65981347776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94624839452).

65981347776 is an abundant number, since it is smaller than the sum of its proper divisors (123268331128).

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

65981347776 is a wasteful number, since it uses less digits than its factorization.

65981347776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76370 (or 76357 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 65981347776 in words is "sixty-five billion, nine hundred eighty-one million, three hundred forty-seven thousand, seven hundred seventy-six".