217875604138741 has 4 divisors (see below), whose sum is σ = 220121744387692. Its totient is φ = 215629463889792.

The previous prime is 217875604138739. The next prime is 217875604138747. The reversal of 217875604138741 is 147831406578712.

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 30599937221841 + 187275666916900 = 5531721^2 + 13684870^2 .

It is a cyclic number.

It is not a de Polignac number, because 217875604138741 - 2¹ = 217875604138739 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 (217875604138747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123070124330 + ... + 1123070124523.

It is an arithmetic number, because the mean of its divisors is an integer number (55030436096923).

Almost surely, 2^{217875604138741} is an apocalyptic number.

It is an amenable number.

217875604138741 is a deficient number, since it is larger than the sum of its proper divisors (2246140248951).

217875604138741 is an equidigital number, since it uses as much as digits as its factorization.

217875604138741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246140248950.

The product of its (nonzero) digits is 63221760, while the sum is 64.

The spelling of 217875604138741 in words is "two hundred seventeen trillion, eight hundred seventy-five billion, six hundred four million, one hundred thirty-eight thousand, seven hundred forty-one".