209885136245 has 16 divisors (see below), whose sum is σ = 267016523328. Its totient is φ = 157830309120.

The previous prime is 209885136229. The next prime is 209885136311. The reversal of 209885136245 is 542631588902.

It is a happy number.

It is not a de Polignac number, because 209885136245 - 2⁴ = 209885136229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1501871 + ... + 1635660.

It is an arithmetic number, because the mean of its divisors is an integer number (16688532708).

Almost surely, 2^209885136245 is an apocalyptic number.

It is an amenable number.

209885136245 is a deficient number, since it is larger than the sum of its proper divisors (57131387083).

209885136245 is a wasteful number, since it uses less digits than its factorization.

209885136245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138340.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 209885136245 in words is "two hundred nine billion, eight hundred eighty-five million, one hundred thirty-six thousand, two hundred forty-five".