218698393091 has 2 divisors, whose sum is σ = 218698393092. Its totient is φ = 218698393090.

The previous prime is 218698393061. The next prime is 218698393139. The reversal of 218698393091 is 190393896812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218698393091 - 2²² = 218694198787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218698393091.

It is not a weakly prime, because it can be changed into another prime (218698393061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109349196545 + 109349196546.

It is an arithmetic number, because the mean of its divisors is an integer number (109349196546).

Almost surely, 2^218698393091 is an apocalyptic number.

218698393091 is a deficient number, since it is larger than the sum of its proper divisors (1).

218698393091 is an equidigital number, since it uses as much as digits as its factorization.

218698393091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The spelling of 218698393091 in words is "two hundred eighteen billion, six hundred ninety-eight million, three hundred ninety-three thousand, ninety-one".