206403535261 has 32 divisors (see below), whose sum is σ = 259685256960. Its totient is φ = 160694930880.

The previous prime is 206403535253. The next prime is 206403535301. The reversal of 206403535261 is 162535304602.

It is not a de Polignac number, because 206403535261 - 2³ = 206403535253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206403535261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206403535231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11516175 + ... + 11534083.

It is an arithmetic number, because the mean of its divisors is an integer number (8115164280).

Almost surely, 2^206403535261 is an apocalyptic number.

It is an amenable number.

206403535261 is a deficient number, since it is larger than the sum of its proper divisors (53281721699).

206403535261 is a wasteful number, since it uses less digits than its factorization.

206403535261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19186 (or 19164 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 206403535261 its reverse (162535304602), we get a palindrome (368938839863).

The spelling of 206403535261 in words is "two hundred six billion, four hundred three million, five hundred thirty-five thousand, two hundred sixty-one".