218497816487 has 2 divisors, whose sum is σ = 218497816488. Its totient is φ = 218497816486.

The previous prime is 218497816351. The next prime is 218497816489. The reversal of 218497816487 is 784618794812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218497816487 - 2⁸ = 218497816231 is a prime.

Together with 218497816489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218497816489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109248908243 + 109248908244.

It is an arithmetic number, because the mean of its divisors is an integer number (109248908244).

Almost surely, 2^218497816487 is an apocalyptic number.

218497816487 is a deficient number, since it is larger than the sum of its proper divisors (1).

218497816487 is an equidigital number, since it uses as much as digits as its factorization.

218497816487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 65.

The spelling of 218497816487 in words is "two hundred eighteen billion, four hundred ninety-seven million, eight hundred sixteen thousand, four hundred eighty-seven".