65193781309944 has 192 divisors, whose sum is σ = 190877527008000. Its totient is φ = 18501034438656.

The previous prime is 65193781309927. The next prime is 65193781309973. The reversal of 65193781309944 is 44990318739156.

It is a happy number.

It is a super-2 number, since 2×65193781309944² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134790447 + ... + 135273249.

It is an arithmetic number, because the mean of its divisors is an integer number (994153786500).

Almost surely, 2^{65193781309944} 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 65193781309944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95438763504000).

65193781309944 is an abundant number, since it is smaller than the sum of its proper divisors (125683745698056).

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

65193781309944 is a wasteful number, since it uses less digits than its factorization.

65193781309944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483602 (or 483591 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 69.

The spelling of 65193781309944 in words is "sixty-five trillion, one hundred ninety-three billion, seven hundred eighty-one million, three hundred nine thousand, nine hundred forty-four".