218640471583 has 2 divisors, whose sum is σ = 218640471584. Its totient is φ = 218640471582.

The previous prime is 218640471421. The next prime is 218640471629. The reversal of 218640471583 is 385174046812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218640471583 - 2²¹ = 218638374431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218640871583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109320235791 + 109320235792.

It is an arithmetic number, because the mean of its divisors is an integer number (109320235792).

Almost surely, 2^218640471583 is an apocalyptic number.

218640471583 is a deficient number, since it is larger than the sum of its proper divisors (1).

218640471583 is an equidigital number, since it uses as much as digits as its factorization.

218640471583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 218640471583 in words is "two hundred eighteen billion, six hundred forty million, four hundred seventy-one thousand, five hundred eighty-three".