205687131316 has 6 divisors (see below), whose sum is σ = 359952479810. Its totient is φ = 102843565656.

The previous prime is 205687131313. The next prime is 205687131317. The reversal of 205687131316 is 613131786502.

It can be written as a sum of positive squares in only one way, i.e., 192703440400 + 12983690916 = 438980^2 + 113946^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205687131313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710891411 + ... + 25710891418.

Almost surely, 2^205687131316 is an apocalyptic number.

It is an amenable number.

205687131316 is a deficient number, since it is larger than the sum of its proper divisors (154265348494).

205687131316 is a wasteful number, since it uses less digits than its factorization.

205687131316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51421782833 (or 51421782831 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 205687131316 in words is "two hundred five billion, six hundred eighty-seven million, one hundred thirty-one thousand, three hundred sixteen".