218581350461 has 2 divisors, whose sum is σ = 218581350462. Its totient is φ = 218581350460.

The previous prime is 218581350391. The next prime is 218581350467. The reversal of 218581350461 is 164053185812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134106834436 + 84474516025 = 366206^2 + 290645^2 .

It is a cyclic number.

It is not a de Polignac number, because 218581350461 - 2²² = 218577156157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218581350467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109290675230 + 109290675231.

It is an arithmetic number, because the mean of its divisors is an integer number (109290675231).

Almost surely, 2^218581350461 is an apocalyptic number.

It is an amenable number.

218581350461 is a deficient number, since it is larger than the sum of its proper divisors (1).

218581350461 is an equidigital number, since it uses as much as digits as its factorization.

218581350461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 218581350461 in words is "two hundred eighteen billion, five hundred eighty-one million, three hundred fifty thousand, four hundred sixty-one".