218497816407 has 16 divisors (see below), whose sum is σ = 316618813280. Its totient is φ = 133226612352.

The previous prime is 218497816351. The next prime is 218497816487. The reversal of 218497816407 is 704618794812.

It is not a de Polignac number, because 218497816407 - 2¹⁹ = 218497292119 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 467438-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218497816487) by changing a digit.

It is a nontrivial repunit in base 467437.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25695328 + ... + 25703829.

It is an arithmetic number, because the mean of its divisors is an integer number (19788675830).

Almost surely, 2^218497816407 is an apocalyptic number.

218497816407 is a deficient number, since it is larger than the sum of its proper divisors (98120996873).

218497816407 is a wasteful number, since it uses less digits than its factorization.

218497816407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51399282.

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 218497816407 in words is "two hundred eighteen billion, four hundred ninety-seven million, eight hundred sixteen thousand, four hundred seven".