218064257 has 2 divisors, whose sum is σ = 218064258. Its totient is φ = 218064256.

The previous prime is 218064247. The next prime is 218064263. The reversal of 218064257 is 752460812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195748081 + 22316176 = 13991^2 + 4724^2 .

It is a cyclic number.

It is not a de Polignac number, because 218064257 - 2⁶ = 218064193 is a prime.

It is not a weakly prime, because it can be changed into another prime (218064247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109032128 + 109032129.

It is an arithmetic number, because the mean of its divisors is an integer number (109032129).

Almost surely, 2^218064257 is an apocalyptic number.

It is an amenable number.

218064257 is a deficient number, since it is larger than the sum of its proper divisors (1).

218064257 is an equidigital number, since it uses as much as digits as its factorization.

218064257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 218064257 is about 14766.9989165030. The cubic root of 218064257 is about 601.9052924378.

The spelling of 218064257 in words is "two hundred eighteen million, sixty-four thousand, two hundred fifty-seven".