201212170745 has 4 divisors (see below), whose sum is σ = 241454604900. Its totient is φ = 160969736592.

The previous prime is 201212170729. The next prime is 201212170751. The reversal of 201212170745 is 547071212102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54091595776 + 147120574969 = 232576^2 + 383563^2 .

It is a cyclic number.

It is not a de Polignac number, because 201212170745 - 2⁴ = 201212170729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20121217070 + ... + 20121217079.

It is an arithmetic number, because the mean of its divisors is an integer number (60363651225).

Almost surely, 2^201212170745 is an apocalyptic number.

It is an amenable number.

201212170745 is a deficient number, since it is larger than the sum of its proper divisors (40242434155).

201212170745 is an equidigital number, since it uses as much as digits as its factorization.

201212170745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40242434154.

The product of its (nonzero) digits is 7840, while the sum is 32.

Adding to 201212170745 its reverse (547071212102), we get a palindrome (748283382847).

The spelling of 201212170745 in words is "two hundred one billion, two hundred twelve million, one hundred seventy thousand, seven hundred forty-five".