218785403651 has 2 divisors, whose sum is σ = 218785403652. Its totient is φ = 218785403650.

The previous prime is 218785403633. The next prime is 218785403653. The reversal of 218785403651 is 156304587812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218785403651 - 2¹⁸ = 218785141507 is a prime.

Together with 218785403653, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218785403651.

It is not a weakly prime, because it can be changed into another prime (218785403653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109392701825 + 109392701826.

It is an arithmetic number, because the mean of its divisors is an integer number (109392701826).

Almost surely, 2^218785403651 is an apocalyptic number.

218785403651 is a deficient number, since it is larger than the sum of its proper divisors (1).

218785403651 is an equidigital number, since it uses as much as digits as its factorization.

218785403651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 218785403651 in words is "two hundred eighteen billion, seven hundred eighty-five million, four hundred three thousand, six hundred fifty-one".