209429417901745 has 16 divisors (see below), whose sum is σ = 258108383654928. Its totient is φ = 163014840126720.

The previous prime is 209429417901707. The next prime is 209429417901749. The reversal of 209429417901745 is 547109714924902.

It can be written as a sum of positive squares in 8 ways, for example, as 15795291000241 + 193634126901504 = 3974329^2 + 13915248^2 .

It is not a de Polignac number, because 209429417901745 - 2³⁹ = 208879662087857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209429417901749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67521727 + ... + 70555243.

It is an arithmetic number, because the mean of its divisors is an integer number (16131773978433).

Almost surely, 2^{209429417901745} is an apocalyptic number.

It is an amenable number.

209429417901745 is a deficient number, since it is larger than the sum of its proper divisors (48678965753183).

209429417901745 is a wasteful number, since it uses less digits than its factorization.

209429417901745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406740.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 209429417901745 in words is "two hundred nine trillion, four hundred twenty-nine billion, four hundred seventeen million, nine hundred one thousand, seven hundred forty-five".