65393861840 has 80 divisors (see below), whose sum is σ = 156565979136. Its totient is φ = 25385702400.

The previous prime is 65393861833. The next prime is 65393861843. The reversal of 65393861840 is 4816839356.

65393861840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65393861843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574289 + ... + 678671.

Almost surely, 2^65393861840 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 65393861840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78282989568).

65393861840 is an abundant number, since it is smaller than the sum of its proper divisors (91172117296).

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

65393861840 is a wasteful number, since it uses less digits than its factorization.

65393861840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104628 (or 104622 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 65393861840 in words is "sixty-five billion, three hundred ninety-three million, eight hundred sixty-one thousand, eight hundred forty".