65897909280 has 576 divisors, whose sum is σ = 264625740288. Its totient is φ = 14619525120.

The previous prime is 65897909267. The next prime is 65897909291. The reversal of 65897909280 is 8290979856.

It is a super-2 number, since 2×65897909280² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 131009509 + ... + 131010011.

It is an arithmetic number, because the mean of its divisors is an integer number (459419688).

Almost surely, 2^65897909280 is an apocalyptic number.

65897909280 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 65897909280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132312870144).

65897909280 is an abundant number, since it is smaller than the sum of its proper divisors (198727831008).

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

65897909280 is a wasteful number, since it uses less digits than its factorization.

65897909280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 65897909280 in words is "sixty-five billion, eight hundred ninety-seven million, nine hundred nine thousand, two hundred eighty".