681938065252 has 6 divisors (see below), whose sum is σ = 1193391614198. Its totient is φ = 340969032624.

The previous prime is 681938065247. The next prime is 681938065253. The reversal of 681938065252 is 252560839186.

It can be written as a sum of positive squares in only one way, i.e., 596997294336 + 84940770916 = 772656^2 + 291446^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681938065193 and 681938065202.

It is not an unprimeable number, because it can be changed into a prime (681938065253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85242258153 + ... + 85242258160.

Almost surely, 2^681938065252 is an apocalyptic number.

It is an amenable number.

681938065252 is a deficient number, since it is larger than the sum of its proper divisors (511453548946).

681938065252 is a wasteful number, since it uses less digits than its factorization.

681938065252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170484516317 (or 170484516315 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 681938065252 in words is "six hundred eighty-one billion, nine hundred thirty-eight million, sixty-five thousand, two hundred fifty-two".