206494748321 has 2 divisors, whose sum is σ = 206494748322. Its totient is φ = 206494748320.

The previous prime is 206494748281. The next prime is 206494748363. The reversal of 206494748321 is 123847494602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162840496225 + 43654252096 = 403535^2 + 208936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206494748321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206494748321.

It is not a weakly prime, because it can be changed into another prime (206494745321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103247374160 + 103247374161.

It is an arithmetic number, because the mean of its divisors is an integer number (103247374161).

Almost surely, 2^206494748321 is an apocalyptic number.

It is an amenable number.

206494748321 is a deficient number, since it is larger than the sum of its proper divisors (1).

206494748321 is an equidigital number, since it uses as much as digits as its factorization.

206494748321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 206494748321 in words is "two hundred six billion, four hundred ninety-four million, seven hundred forty-eight thousand, three hundred twenty-one".