218408547541 has 4 divisors (see below), whose sum is σ = 218640651084. Its totient is φ = 218176444000.

The previous prime is 218408547499. The next prime is 218408547563. The reversal of 218408547541 is 145745804812.

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 176606700516 + 41801847025 = 420246^2 + 204455^2 .

It is a cyclic number.

It is not a de Polignac number, because 218408547541 - 2¹¹ = 218408545493 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 (218408547571) 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, 116050360 + ... + 116052241.

It is an arithmetic number, because the mean of its divisors is an integer number (54660162771).

Almost surely, 2^218408547541 is an apocalyptic number.

It is an amenable number.

218408547541 is a deficient number, since it is larger than the sum of its proper divisors (232103543).

218408547541 is an equidigital number, since it uses as much as digits as its factorization.

218408547541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232103542.

The product of its (nonzero) digits is 1433600, while the sum is 49.

The spelling of 218408547541 in words is "two hundred eighteen billion, four hundred eight million, five hundred forty-seven thousand, five hundred forty-one".