671321811600000 has 5376 divisors, whose sum is σ = 2876990805803520. Its totient is φ = 154524672000000.

The previous prime is 671321811599977. The next prime is 671321811600067. The reversal of 671321811600000 is 6118123176.

671321811600000 is a `hidden beast` number, since 6 + 7 + 1 + 32 + 1 + 8 + 11 + 600 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 671 ways as a sum of consecutive naturals, for example, 9196189199964 + ... + 9196189200036.

It is an arithmetic number, because the mean of its divisors is an integer number (535154539770).

Almost surely, 2^{671321811600000} is an apocalyptic number.

671321811600000 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 671321811600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438495402901760).

671321811600000 is an abundant number, since it is smaller than the sum of its proper divisors (2205668994203520).

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

671321811600000 is an frugal number, since it uses more digits than its factorization.

671321811600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

Adding to 671321811600000 its reverse (6118123176), we get a palindrome (671327929723176).

The spelling of 671321811600000 in words is "six hundred seventy-one trillion, three hundred twenty-one billion, eight hundred eleven million, six hundred thousand".