200643972489 has 27 divisors (see below), whose sum is σ = 307905143143. Its totient is φ = 125879923392.

The previous prime is 200643972443. The next prime is 200643972509. The reversal of 200643972489 is 984279346002.

The square root of 200643972489 is 447933.

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

200643972489 is a `hidden beast` number, since 2 + 0 + 0 + 6 + 4 + 397 + 248 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 156210705225 + 44433267264 = 395235^2 + 210792^2 .

It is not a de Polignac number, because 200643972489 - 2⁹ = 200643971977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200643972689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22840192 + ... + 22848974.

Almost surely, 2^200643972489 is an apocalyptic number.

200643972489 is the 447933-rd square number.

200643972489 is the 223967-th centered octagonal number.

It is an amenable number.

200643972489 is a deficient number, since it is larger than the sum of its proper divisors (107261170654).

200643972489 is an frugal number, since it uses more digits than its factorization.

200643972489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17606 (or 8803 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 200643972489 in words is "two hundred billion, six hundred forty-three million, nine hundred seventy-two thousand, four hundred eighty-nine".