206710694688969 has 135 divisors (see below), whose sum is σ = 320267175338583. Its totient is φ = 132866841155328.

The previous prime is 206710694688929. The next prime is 206710694688983. The reversal of 206710694688969 is 969886496017602.

The square root of 206710694688969 is 14377437.

It is a perfect power (a square), and thus also a powerful number.

206710694688969 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 1 + 0 + 69 + 468 + 8 + 96 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 92820988953225 + 113889705735744 = 9634365^2 + 10671912^2 .

It is not a de Polignac number, because 206710694688969 - 2⁹ = 206710694688457 is a prime.

It is a super-2 number, since 2×206710694688969² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (206710694688929) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 539714607352 + ... + 539714607734.

Almost surely, 2^{206710694688969} is an apocalyptic number.

206710694688969 is the 14377437-th square number.

206710694688969 is the 7188719-th centered octagonal number.

It is an amenable number.

206710694688969 is a deficient number, since it is larger than the sum of its proper divisors (113556480649614).

206710694688969 is an frugal number, since it uses more digits than its factorization.

206710694688969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 3386105856, while the sum is 81.

206710694688969 divided by its sum of digits (81) gives a square (2551983885049 = 1597493²).

The spelling of 206710694688969 in words is "two hundred six trillion, seven hundred ten billion, six hundred ninety-four million, six hundred eighty-eight thousand, nine hundred sixty-nine".