209136643983 has 8 divisors (see below), whose sum is σ = 309832065200. Its totient is φ = 139424429304.

The previous prime is 209136643951. The next prime is 209136643997. The reversal of 209136643983 is 389346631902.

It is not a de Polignac number, because 209136643983 - 2⁵ = 209136643951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209136603983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3872900788 + ... + 3872900841.

It is an arithmetic number, because the mean of its divisors is an integer number (38729008150).

Almost surely, 2^209136643983 is an apocalyptic number.

209136643983 is a deficient number, since it is larger than the sum of its proper divisors (100695421217).

209136643983 is an equidigital number, since it uses as much as digits as its factorization.

209136643983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745801638 (or 7745801632 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The spelling of 209136643983 in words is "two hundred nine billion, one hundred thirty-six million, six hundred forty-three thousand, nine hundred eighty-three".