65998495180800 has 5184 divisors, whose sum is σ = 322370526965760. Its totient is φ = 13002646487040.

The previous prime is 65998495180769. The next prime is 65998495180811. The reversal of 65998495180800 is 808159489956.

65998495180800 is a `hidden beast` number, since 6 + 59 + 9 + 8 + 495 + 1 + 8 + 0 + 80 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (5184).

It is a super-2 number, since 2×65998495180800² (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 an unprimeable number.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 519673190337 + ... + 519673190463.

It is an arithmetic number, because the mean of its divisors is an integer number (62185672640).

Almost surely, 2^{65998495180800} is an apocalyptic number.

65998495180800 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 65998495180800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161185263482880).

65998495180800 is an abundant number, since it is smaller than the sum of its proper divisors (256372031784960).

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

65998495180800 is a wasteful number, since it uses less digits than its factorization.

65998495180800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 72.

The spelling of 65998495180800 in words is "sixty-five trillion, nine hundred ninety-eight billion, four hundred ninety-five million, one hundred eighty thousand, eight hundred".