65973921920 has 128 divisors (see below), whose sum is σ = 166171953600. Its totient is φ = 24977756160.

The previous prime is 65973921889. The next prime is 65973921943. The reversal of 65973921920 is 2912937956.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19709687 + ... + 19713033.

Almost surely, 2^65973921920 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 65973921920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83085976800).

65973921920 is an abundant number, since it is smaller than the sum of its proper divisors (100198031680).

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

65973921920 is a wasteful number, since it uses less digits than its factorization.

65973921920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 65973921920 in words is "sixty-five billion, nine hundred seventy-three million, nine hundred twenty-one thousand, nine hundred twenty".