206129392065 has 24 divisors (see below), whose sum is σ = 361305458280. Its totient is φ = 108700441344.

The previous prime is 206129392043. The next prime is 206129392067. The reversal of 206129392065 is 560293921602.

206129392065 is a `hidden beast` number, since 2 + 0 + 612 + 9 + 3 + 9 + 20 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 57881664 + 206071510401 = 7608^2 + 453951^2 .

It is not a de Polignac number, because 206129392065 - 2²⁰ = 206128343489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 206129392065.

It is not an unprimeable number, because it can be changed into a prime (206129392067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25730002 + ... + 25738011.

It is an arithmetic number, because the mean of its divisors is an integer number (15054394095).

Almost surely, 2^206129392065 is an apocalyptic number.

It is an amenable number.

206129392065 is a deficient number, since it is larger than the sum of its proper divisors (155176066215).

206129392065 is a wasteful number, since it uses less digits than its factorization.

206129392065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51468113 (or 51468110 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 206129392065 in words is "two hundred six billion, one hundred twenty-nine million, three hundred ninety-two thousand, sixty-five".