65076721920 has 864 divisors, whose sum is σ = 273738366720. Its totient is φ = 14511882240.

The previous prime is 65076721909. The next prime is 65076721937. The reversal of 65076721920 is 2912767056.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1587237100 + ... + 1587237140.

Almost surely, 2^65076721920 is an apocalyptic number.

65076721920 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 65076721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136869183360).

65076721920 is an abundant number, since it is smaller than the sum of its proper divisors (208661644800).

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

65076721920 is an frugal number, since it uses more digits than its factorization.

65076721920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 65076721920 in words is "sixty-five billion, seventy-six million, seven hundred twenty-one thousand, nine hundred twenty".