681938332071 has 24 divisors (see below), whose sum is σ = 942214897104. Its totient is φ = 438702163200.

The previous prime is 681938332069. The next prime is 681938332093. The reversal of 681938332071 is 170233839186.

It is not a de Polignac number, because 681938332071 - 2¹ = 681938332069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681938352071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4468885 + ... + 4618961.

It is an arithmetic number, because the mean of its divisors is an integer number (39258954046).

Almost surely, 2^681938332071 is an apocalyptic number.

681938332071 is a deficient number, since it is larger than the sum of its proper divisors (260276565033).

681938332071 is a wasteful number, since it uses less digits than its factorization.

681938332071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151939 (or 151910 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 681938332071 in words is "six hundred eighty-one billion, nine hundred thirty-eight million, three hundred thirty-two thousand, seventy-one".