218956458277 has 2 divisors, whose sum is σ = 218956458278. Its totient is φ = 218956458276.

The previous prime is 218956458229. The next prime is 218956458307. The reversal of 218956458277 is 772854659812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204671188836 + 14285269441 = 452406^2 + 119521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218956458277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218956450277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109478229138 + 109478229139.

It is an arithmetic number, because the mean of its divisors is an integer number (109478229139).

Almost surely, 2^218956458277 is an apocalyptic number.

It is an amenable number.

218956458277 is a deficient number, since it is larger than the sum of its proper divisors (1).

218956458277 is an equidigital number, since it uses as much as digits as its factorization.

218956458277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 64.

The spelling of 218956458277 in words is "two hundred eighteen billion, nine hundred fifty-six million, four hundred fifty-eight thousand, two hundred seventy-seven".