218415517451 has 2 divisors, whose sum is σ = 218415517452. Its totient is φ = 218415517450.

The previous prime is 218415517429. The next prime is 218415517459. The reversal of 218415517451 is 154715514812.

218415517451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218415517451 is a prime.

It is not a weakly prime, because it can be changed into another prime (218415517459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109207758725 + 109207758726.

It is an arithmetic number, because the mean of its divisors is an integer number (109207758726).

Almost surely, 2^218415517451 is an apocalyptic number.

218415517451 is a deficient number, since it is larger than the sum of its proper divisors (1).

218415517451 is an equidigital number, since it uses as much as digits as its factorization.

218415517451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224000, while the sum is 44.

The spelling of 218415517451 in words is "two hundred eighteen billion, four hundred fifteen million, five hundred seventeen thousand, four hundred fifty-one".