206665205240351 has 16 divisors (see below), whose sum is σ = 242857062873600. Its totient is φ = 173381363485920.

The previous prime is 206665205240327. The next prime is 206665205240357. The reversal of 206665205240351 is 153042502566602.

It is a cyclic number.

It is not a de Polignac number, because 206665205240351 - 2¹⁸ = 206665204978207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206665205240296 and 206665205240305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206665205240357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182699051 + ... + 183826748.

It is an arithmetic number, because the mean of its divisors is an integer number (15178566429600).

Almost surely, 2^{206665205240351} is an apocalyptic number.

206665205240351 is a deficient number, since it is larger than the sum of its proper divisors (36191857633249).

206665205240351 is a wasteful number, since it uses less digits than its factorization.

206665205240351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366529766.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 206665205240351 in words is "two hundred six trillion, six hundred sixty-five billion, two hundred five million, two hundred forty thousand, three hundred fifty-one".