209986951361933 has 2 divisors, whose sum is σ = 209986951361934. Its totient is φ = 209986951361932.

The previous prime is 209986951361923. The next prime is 209986951361947. The reversal of 209986951361933 is 339163159689902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209491957502569 + 494993859364 = 14473837^2 + 703558^2 .

It is a cyclic number.

It is not a de Polignac number, because 209986951361933 - 2²⁴ = 209986934584717 is a prime.

It is a super-2 number, since 2×209986951361933² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209986951361923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104993475680966 + 104993475680967.

It is an arithmetic number, because the mean of its divisors is an integer number (104993475680967).

Almost surely, 2^{209986951361933} is an apocalyptic number.

It is an amenable number.

209986951361933 is a deficient number, since it is larger than the sum of its proper divisors (1).

209986951361933 is an equidigital number, since it uses as much as digits as its factorization.

209986951361933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 510183360, while the sum is 74.

The spelling of 209986951361933 in words is "two hundred nine trillion, nine hundred eighty-six billion, nine hundred fifty-one million, three hundred sixty-one thousand, nine hundred thirty-three".