206206765405257 has 64 divisors (see below), whose sum is σ = 311920561704960. Its totient is φ = 120480419457024.

The previous prime is 206206765405243. The next prime is 206206765405259. The reversal of 206206765405257 is 752504567602602.

It is not a de Polignac number, because 206206765405257 - 2²³ = 206206757016649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206206765405197 and 206206765405206.

It is not an unprimeable number, because it can be changed into a prime (206206765405259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7335588 + ... + 21592229.

It is an arithmetic number, because the mean of its divisors is an integer number (4873758776640).

Almost surely, 2^{206206765405257} is an apocalyptic number.

It is an amenable number.

206206765405257 is a deficient number, since it is larger than the sum of its proper divisors (105713796299703).

206206765405257 is a wasteful number, since it uses less digits than its factorization.

206206765405257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28928022.

The product of its (nonzero) digits is 42336000, while the sum is 57.

The spelling of 206206765405257 in words is "two hundred six trillion, two hundred six billion, seven hundred sixty-five million, four hundred five thousand, two hundred fifty-seven".