65980423998720 has 3456 divisors, whose sum is σ = 304442897794560. Its totient is φ = 13488685056000.

The previous prime is 65980423998719. The next prime is 65980423998761. The reversal of 65980423998720 is 2789932408956.

65980423998720 is a `hidden beast` number, since 6 + 5 + 98 + 0 + 423 + 9 + 98 + 7 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (3456).

It is a super-2 number, since 2×65980423998720² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 164539710520 + ... + 164539710920.

It is an arithmetic number, because the mean of its divisors is an integer number (88091116260).

Almost surely, 2^{65980423998720} is an apocalyptic number.

65980423998720 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 65980423998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152221448897280).

65980423998720 is an abundant number, since it is smaller than the sum of its proper divisors (238462473795840).

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

65980423998720 is a wasteful number, since it uses less digits than its factorization.

65980423998720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 470292480, while the sum is 72.

The spelling of 65980423998720 in words is "sixty-five trillion, nine hundred eighty billion, four hundred twenty-three million, nine hundred ninety-eight thousand, seven hundred twenty".