218947854691 has 2 divisors, whose sum is σ = 218947854692. Its totient is φ = 218947854690.

The previous prime is 218947854679. The next prime is 218947854703. The reversal of 218947854691 is 196458749812.

It is a balanced prime because it is at equal distance from previous prime (218947854679) and next prime (218947854703).

It is a cyclic number.

It is not a de Polignac number, because 218947854691 - 2⁹ = 218947854179 is a prime.

It is not a weakly prime, because it can be changed into another prime (218947852691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109473927345 + 109473927346.

It is an arithmetic number, because the mean of its divisors is an integer number (109473927346).

Almost surely, 2^218947854691 is an apocalyptic number.

218947854691 is a deficient number, since it is larger than the sum of its proper divisors (1).

218947854691 is an equidigital number, since it uses as much as digits as its factorization.

218947854691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 64.

The spelling of 218947854691 in words is "two hundred eighteen billion, nine hundred forty-seven million, eight hundred fifty-four thousand, six hundred ninety-one".