206864487593 has 2 divisors, whose sum is σ = 206864487594. Its totient is φ = 206864487592.

The previous prime is 206864487563. The next prime is 206864487617. The reversal of 206864487593 is 395784468602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136505864089 + 70358623504 = 369467^2 + 265252^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206864487593 is a prime.

It is a super-2 number, since 2×206864487593² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206864487503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103432243796 + 103432243797.

It is an arithmetic number, because the mean of its divisors is an integer number (103432243797).

Almost surely, 2^206864487593 is an apocalyptic number.

It is an amenable number.

206864487593 is a deficient number, since it is larger than the sum of its proper divisors (1).

206864487593 is an equidigital number, since it uses as much as digits as its factorization.

206864487593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 62.

The spelling of 206864487593 in words is "two hundred six billion, eight hundred sixty-four million, four hundred eighty-seven thousand, five hundred ninety-three".