681326802450 has 288 divisors, whose sum is σ = 2164741542912. Its totient is φ = 150341184000.

The previous prime is 681326802427. The next prime is 681326802487. The reversal of 681326802450 is 54208623186.

681326802450 is a `hidden beast` number, since 6 + 8 + 1 + 326 + 80 + 245 + 0 = 666.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681326802396 and 681326802405.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 41102364 + ... + 41118936.

Almost surely, 2^681326802450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681326802450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1082370771456).

681326802450 is an abundant number, since it is smaller than the sum of its proper divisors (1483414740462).

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

681326802450 is a wasteful number, since it uses less digits than its factorization.

681326802450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17050 (or 17042 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 681326802450 in words is "six hundred eighty-one billion, three hundred twenty-six million, eight hundred two thousand, four hundred fifty".