65811859344 has 640 divisors, whose sum is σ = 241544540160. Its totient is φ = 16802311680.

The previous prime is 65811859303. The next prime is 65811859361. The reversal of 65811859344 is 44395811856.

It is a happy number.

65811859344 is a `hidden beast` number, since 6 + 5 + 8 + 1 + 1 + 8 + 593 + 44 = 666.

It is a super-2 number, since 2×65811859344² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 334070254 + ... + 334070450.

It is an arithmetic number, because the mean of its divisors is an integer number (377413344).

Almost surely, 2^65811859344 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 65811859344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120772270080).

65811859344 is an abundant number, since it is smaller than the sum of its proper divisors (175732680816).

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

65811859344 is a wasteful number, since it uses less digits than its factorization.

65811859344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 303 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 65811859344 in words is "sixty-five billion, eight hundred eleven million, eight hundred fifty-nine thousand, three hundred forty-four".