218681161207 has 4 divisors (see below), whose sum is σ = 218762852776. Its totient is φ = 218599469640.

The previous prime is 218681161201. The next prime is 218681161273. The reversal of 218681161207 is 702161186812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218681161207 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 (218681161201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40841769 + ... + 40847122.

It is an arithmetic number, because the mean of its divisors is an integer number (54690713194).

Almost surely, 2^218681161207 is an apocalyptic number.

218681161207 is a deficient number, since it is larger than the sum of its proper divisors (81691569).

218681161207 is an equidigital number, since it uses as much as digits as its factorization.

218681161207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81691568.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 218681161207 in words is "two hundred eighteen billion, six hundred eighty-one million, one hundred sixty-one thousand, two hundred seven".