65440791800 has 96 divisors (see below), whose sum is σ = 160964400000. Its totient is φ = 24673714560.

The previous prime is 65440791761. The next prime is 65440791853. The reversal of 65440791800 is 819704456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712931 + ... + 799469.

It is an arithmetic number, because the mean of its divisors is an integer number (1676712500).

Almost surely, 2^65440791800 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 65440791800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80482200000).

65440791800 is an abundant number, since it is smaller than the sum of its proper divisors (95523608200).

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

65440791800 is a wasteful number, since it uses less digits than its factorization.

65440791800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86773 (or 86764 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 65440791800 in words is "sixty-five billion, four hundred forty million, seven hundred ninety-one thousand, eight hundred".