218639075899393 has 4 divisors (see below), whose sum is σ = 231500198011140. Its totient is φ = 205777953787648.

The previous prime is 218639075899369. The next prime is 218639075899421. The reversal of 218639075899393 is 393998570936812.

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 127828982597904 + 90810093301489 = 11306148^2 + 9529433^2 .

It is a cyclic number.

It is not a de Polignac number, because 218639075899393 - 2²¹ = 218639073802241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218639075899333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6430561055848 + ... + 6430561055881.

It is an arithmetic number, because the mean of its divisors is an integer number (57875049502785).

Almost surely, 2^{218639075899393} is an apocalyptic number.

It is an amenable number.

218639075899393 is a deficient number, since it is larger than the sum of its proper divisors (12861122111747).

218639075899393 is a wasteful number, since it uses less digits than its factorization.

218639075899393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12861122111746.

The product of its (nonzero) digits is 4761711360, while the sum is 82.

The spelling of 218639075899393 in words is "two hundred eighteen trillion, six hundred thirty-nine billion, seventy-five million, eight hundred ninety-nine thousand, three hundred ninety-three".