65422871778 has 64 divisors (see below), whose sum is σ = 149013043200. Its totient is φ = 18954735360.

The previous prime is 65422871737. The next prime is 65422871827. The reversal of 65422871778 is 87717822456.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3952203 + ... + 3968721.

It is an arithmetic number, because the mean of its divisors is an integer number (2328328800).

Almost surely, 2^65422871778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65422871778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74506521600).

65422871778 is an abundant number, since it is smaller than the sum of its proper divisors (83590171422).

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

65422871778 is a wasteful number, since it uses less digits than its factorization.

65422871778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19167.

The product of its digits is 10536960, while the sum is 57.

The spelling of 65422871778 in words is "sixty-five billion, four hundred twenty-two million, eight hundred seventy-one thousand, seven hundred seventy-eight".