681571123200 has 972 divisors, whose sum is σ = 2697715710144. Its totient is φ = 164364288000.

The previous prime is 681571123183. The next prime is 681571123223. The reversal of 681571123200 is 2321175186.

681571123200 is a `hidden beast` number, since 6 + 81 + 571 + 1 + 2 + 3 + 2 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 3568435105 + ... + 3568435295.

Almost surely, 2^681571123200 is an apocalyptic number.

681571123200 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 681571123200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348857855072).

681571123200 is an abundant number, since it is smaller than the sum of its proper divisors (2016144586944).

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

681571123200 is a wasteful number, since it uses less digits than its factorization.

681571123200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 681571123200 its reverse (2321175186), we get a palindrome (683892298386).

The spelling of 681571123200 in words is "six hundred eighty-one billion, five hundred seventy-one million, one hundred twenty-three thousand, two hundred".