206916861006025 has 9 divisors (see below), whose sum is σ = 256576996832053. Its totient is φ = 165533431266400.

The previous prime is 206916861005977. The next prime is 206916861006113. The reversal of 206916861006025 is 520600168619602.

The square root of 206916861006025 is 14384605.

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

It can be written as a sum of positive squares in 4 ways, for example, as 82634408580409 + 124282452425616 = 9090347^2 + 11148204^2 .

It is not a de Polignac number, because 206916861006025 - 2⁴⁷ = 66179372650697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 70484565 + ... + 73361485.

Almost surely, 2^{206916861006025} is an apocalyptic number.

206916861006025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

206916861006025 is the 14384605-th square number.

206916861006025 is the 7192303-rd centered octagonal number.

It is an amenable number.

206916861006025 is a deficient number, since it is larger than the sum of its proper divisors (49660135826028).

206916861006025 is an frugal number, since it uses more digits than its factorization.

206916861006025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753852 (or 2876926 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 206916861006025 in words is "two hundred six trillion, nine hundred sixteen billion, eight hundred sixty-one million, six thousand, twenty-five".