218361232057 has 2 divisors, whose sum is σ = 218361232058. Its totient is φ = 218361232056.

The previous prime is 218361232049. The next prime is 218361232093. The reversal of 218361232057 is 750232163812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169895649856 + 48465582201 = 412184^2 + 220149^2 .

It is a cyclic number.

It is not a de Polignac number, because 218361232057 - 2³ = 218361232049 is a prime.

It is not a weakly prime, because it can be changed into another prime (218361232157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109180616028 + 109180616029.

It is an arithmetic number, because the mean of its divisors is an integer number (109180616029).

Almost surely, 2^218361232057 is an apocalyptic number.

It is an amenable number.

218361232057 is a deficient number, since it is larger than the sum of its proper divisors (1).

218361232057 is an equidigital number, since it uses as much as digits as its factorization.

218361232057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 218361232057 its reverse (750232163812), we get a palindrome (968593395869).

The spelling of 218361232057 in words is "two hundred eighteen billion, three hundred sixty-one million, two hundred thirty-two thousand, fifty-seven".