681398803386 has 112 divisors (see below), whose sum is σ = 1751905798848. Its totient is φ = 194625504000.

The previous prime is 681398803339. The next prime is 681398803409. The reversal of 681398803386 is 683308893186.

681398803386 is a `hidden beast` number, since 68 + 1 + 398 + 80 + 33 + 86 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 41336266 + ... + 41352746.

Almost surely, 2^681398803386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681398803386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875952899424).

681398803386 is an abundant number, since it is smaller than the sum of its proper divisors (1070506995462).

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

681398803386 is a wasteful number, since it uses less digits than its factorization.

681398803386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20559 (or 20544 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 681398803386 in words is "six hundred eighty-one billion, three hundred ninety-eight million, eight hundred three thousand, three hundred eighty-six".