218286709257551 has 16 divisors (see below), whose sum is σ = 238635774988800. Its totient is φ = 198022213598400.

The previous prime is 218286709257541. The next prime is 218286709257563. The reversal of 218286709257551 is 155752907682812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218286709257551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218286709257541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 764711 + ... + 20908328.

It is an arithmetic number, because the mean of its divisors is an integer number (14914735936800).

Almost surely, 2^{218286709257551} is an apocalyptic number.

218286709257551 is a deficient number, since it is larger than the sum of its proper divisors (20349065731249).

218286709257551 is a wasteful number, since it uses less digits than its factorization.

218286709257551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21674990.

The product of its (nonzero) digits is 169344000, while the sum is 68.

The spelling of 218286709257551 in words is "two hundred eighteen trillion, two hundred eighty-six billion, seven hundred nine million, two hundred fifty-seven thousand, five hundred fifty-one".