206607997993 has 2 divisors, whose sum is σ = 206607997994. Its totient is φ = 206607997992.

The previous prime is 206607997969. The next prime is 206607998053. The reversal of 206607997993 is 399799706602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140976219024 + 65631778969 = 375468^2 + 256187^2 .

It is a cyclic number.

It is not a de Polignac number, because 206607997993 - 2⁹ = 206607997481 is a prime.

It is not a weakly prime, because it can be changed into another prime (206607997943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103303998996 + 103303998997.

It is an arithmetic number, because the mean of its divisors is an integer number (103303998997).

Almost surely, 2^206607997993 is an apocalyptic number.

It is an amenable number.

206607997993 is a deficient number, since it is larger than the sum of its proper divisors (1).

206607997993 is an equidigital number, since it uses as much as digits as its factorization.

206607997993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69441624, while the sum is 67.

The spelling of 206607997993 in words is "two hundred six billion, six hundred seven million, nine hundred ninety-seven thousand, nine hundred ninety-three".