209984768026 has 24 divisors (see below), whose sum is σ = 366580124820. Its totient is φ = 89833054080.

The previous prime is 209984768023. The next prime is 209984768051. The reversal of 209984768026 is 620867489902.

It can be written as a sum of positive squares in 2 ways, for example, as 201767164225 + 8217603801 = 449185^2 + 90651^2 .

It is not an unprimeable number, because it can be changed into a prime (209984768023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25516641 + ... + 25524868.

Almost surely, 2^209984768026 is an apocalyptic number.

209984768026 is a deficient number, since it is larger than the sum of its proper divisors (156595356794).

209984768026 is a wasteful number, since it uses less digits than its factorization.

209984768026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51041550 (or 51041539 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 209984768026 in words is "two hundred nine billion, nine hundred eighty-four million, seven hundred sixty-eight thousand, twenty-six".