218172545041 has 4 divisors (see below), whose sum is σ = 238006412784. Its totient is φ = 198338677300.

The previous prime is 218172545033. The next prime is 218172545069. The reversal of 218172545041 is 140545271812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218172545041 - 2³ = 218172545033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218172544985 and 218172545003.

It is not an unprimeable number, because it can be changed into a prime (218172545011) 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, 9916933855 + ... + 9916933876.

It is an arithmetic number, because the mean of its divisors is an integer number (59501603196).

Almost surely, 2^218172545041 is an apocalyptic number.

It is an amenable number.

218172545041 is a deficient number, since it is larger than the sum of its proper divisors (19833867743).

218172545041 is a wasteful number, since it uses less digits than its factorization.

218172545041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19833867742.

The product of its (nonzero) digits is 89600, while the sum is 40.

The spelling of 218172545041 in words is "two hundred eighteen billion, one hundred seventy-two million, five hundred forty-five thousand, forty-one".