206986781696 has 22 divisors (see below), whose sum is σ = 413771429910. Its totient is φ = 103493390336.

The previous prime is 206986781681. The next prime is 206986781711. The reversal of 206986781696 is 696187689602.

It is an interprime number because it is at equal distance from previous prime (206986781681) and next prime (206986781711).

It can be written as a sum of positive squares in only one way, i.e., 200704000000 + 6282781696 = 448000^2 + 79264^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101066741 + ... + 101068788.

Almost surely, 2^206986781696 is an apocalyptic number.

It is an amenable number.

206986781696 is a deficient number, since it is larger than the sum of its proper divisors (206784648214).

206986781696 is an equidigital number, since it uses as much as digits as its factorization.

206986781696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202135549 (or 202135531 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 68.

Adding to 206986781696 its sum of digits (68), we get a square (206986781764 = 454958²).

The spelling of 206986781696 in words is "two hundred six billion, nine hundred eighty-six million, seven hundred eighty-one thousand, six hundred ninety-six".