65881880064 has 1440 divisors, whose sum is σ = 276758786304. Its totient is φ = 15109079040.

The previous prime is 65881880033. The next prime is 65881880089. The reversal of 65881880064 is 46008818856.

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

It is a congruent 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 143 ways as a sum of consecutive naturals, for example, 2864429557 + ... + 2864429579.

Almost surely, 2^65881880064 is an apocalyptic number.

65881880064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65881880064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138379393152).

65881880064 is an abundant number, since it is smaller than the sum of its proper divisors (210876906240).

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

65881880064 is a wasteful number, since it uses less digits than its factorization.

65881880064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 54.

The spelling of 65881880064 in words is "sixty-five billion, eight hundred eighty-one million, eight hundred eighty thousand, sixty-four".