681390417652 has 24 divisors (see below), whose sum is σ = 1364906894400. Its totient is φ = 291568880640.

The previous prime is 681390417649. The next prime is 681390417779. The reversal of 681390417652 is 256714093186.

It is a self number, because there is not a number n which added to its sum of digits gives 681390417652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18964402 + ... + 19000297.

It is an arithmetic number, because the mean of its divisors is an integer number (56871120600).

It is a 1-persistent number, because it is pandigital, but 2⋅681390417652 = 1362780835304 is not.

Almost surely, 2^681390417652 is an apocalyptic number.

It is an amenable number.

681390417652 is an abundant number, since it is smaller than the sum of its proper divisors (683516476748).

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

681390417652 is a wasteful number, since it uses less digits than its factorization.

681390417652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37965351 (or 37965349 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 681390417652 in words is "six hundred eighty-one billion, three hundred ninety million, four hundred seventeen thousand, six hundred fifty-two".