65818087720 has 768 divisors, whose sum is σ = 209914675200. Its totient is φ = 18289152000.

The previous prime is 65818087717. The next prime is 65818087763. The reversal of 65818087720 is 2778081856.

It is a happy number.

It is a super-2 number, since 2×65818087720² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 901617604 + ... + 901617676.

It is an arithmetic number, because the mean of its divisors is an integer number (273326400).

Almost surely, 2^65818087720 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 65818087720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104957337600).

65818087720 is an abundant number, since it is smaller than the sum of its proper divisors (144096587480).

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

65818087720 is a wasteful number, since it uses less digits than its factorization.

65818087720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 52.

The spelling of 65818087720 in words is "sixty-five billion, eight hundred eighteen million, eighty-seven thousand, seven hundred twenty".