206887612801 has 3 divisors (see below), whose sum is σ = 206888067651. Its totient is φ = 206887157952.

The previous prime is 206887612721. The next prime is 206887612859. The reversal of 206887612801 is 108216788602.

The square root of 206887612801 is 454849.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 18184252801 + 188703360000 = 134849^2 + 434400^2 .

It is not a de Polignac number, because 206887612801 - 2⁹ = 206887612289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206887612861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 227425 + ... + 682273.

It is an arithmetic number, because the mean of its divisors is an integer number (68962689217).

Almost surely, 2^206887612801 is an apocalyptic number.

206887612801 is the 454849-th square number.

206887612801 is the 227425-th centered octagonal number.

It is an amenable number.

206887612801 is a deficient number, since it is larger than the sum of its proper divisors (454850).

206887612801 is an frugal number, since it uses more digits than its factorization.

206887612801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909698 (or 454849 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

Multiplying 206887612801 by its sum of digits (49), we get a square (10137493027249 = 3183943²).

The spelling of 206887612801 in words is "two hundred six billion, eight hundred eighty-seven million, six hundred twelve thousand, eight hundred one".