217136260745 has 4 divisors (see below), whose sum is σ = 260563512900. Its totient is φ = 173709008592.

The previous prime is 217136260721. The next prime is 217136260753. The reversal of 217136260745 is 547062631712.

It is a happy number.

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 41588668489 + 175547592256 = 203933^2 + 418984^2 .

It is a cyclic number.

It is not a de Polignac number, because 217136260745 - 2⁶ = 217136260681 is a prime.

It is a super-3 number, since 3×217136260745³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 217136260696 and 217136260705.

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 3 ways as a sum of consecutive naturals, for example, 21713626070 + ... + 21713626079.

It is an arithmetic number, because the mean of its divisors is an integer number (65140878225).

Almost surely, 2^217136260745 is an apocalyptic number.

It is an amenable number.

217136260745 is a deficient number, since it is larger than the sum of its proper divisors (43427252155).

217136260745 is an equidigital number, since it uses as much as digits as its factorization.

217136260745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43427252154.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 217136260745 in words is "two hundred seventeen billion, one hundred thirty-six million, two hundred sixty thousand, seven hundred forty-five".