65340666880 has 352 divisors, whose sum is σ = 175219531776. Its totient is φ = 23253221376.

The previous prime is 65340666869. The next prime is 65340666887. The reversal of 65340666880 is 8866604356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65340666887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254243712 + ... + 254243968.

Almost surely, 2^65340666880 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 65340666880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87609765888).

65340666880 is an abundant number, since it is smaller than the sum of its proper divisors (109878864896).

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

65340666880 is a wasteful number, since it uses less digits than its factorization.

65340666880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 65340666880 in words is "sixty-five billion, three hundred forty million, six hundred sixty-six thousand, eight hundred eighty".