65989856000 has 144 divisors (see below), whose sum is σ = 165035078208. Its totient is φ = 26292224000.

The previous prime is 65989855999. The next prime is 65989856017. The reversal of 65989856000 is 65898956.

It is a super-2 number, since 2×65989856000² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 8412080 + ... + 8419920.

It is an arithmetic number, because the mean of its divisors is an integer number (1146076932).

Almost surely, 2^65989856000 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 65989856000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82517539104).

65989856000 is an abundant number, since it is smaller than the sum of its proper divisors (99045222208).

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

65989856000 is an equidigital number, since it uses as much as digits as its factorization.

65989856000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8135 (or 8111 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 65989856000 in words is "sixty-five billion, nine hundred eighty-nine million, eight hundred fifty-six thousand".