65488227840 has 720 divisors, whose sum is σ = 269643714912. Its totient is φ = 14941863936.

The previous prime is 65488227733. The next prime is 65488227841. The reversal of 65488227840 is 4872288456.

65488227840 is a `hidden beast` number, since 6 + 548 + 8 + 22 + 78 + 4 + 0 = 666.

65488227840 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 (720).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65488227841) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 117572842 + ... + 117573398.

Almost surely, 2^65488227840 is an apocalyptic number.

65488227840 is a gapful number since it is divisible by the number (60) 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 65488227840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134821857456).

65488227840 is an abundant number, since it is smaller than the sum of its proper divisors (204155487072).

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

65488227840 is an frugal number, since it uses more digits than its factorization.

65488227840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 6881280, while the sum is 54.

The spelling of 65488227840 in words is "sixty-five billion, four hundred eighty-eight million, two hundred twenty-seven thousand, eight hundred forty".