218734720079 has 4 divisors (see below), whose sum is σ = 218737235976. Its totient is φ = 218732204184.

The previous prime is 218734720049. The next prime is 218734720109. The reversal of 218734720079 is 970027437812.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (218734720049) and next prime (218734720109).

It is a cyclic number.

It is not a de Polignac number, because 218734720079 - 2¹⁶ = 218734654543 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 (218734720049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122689 + ... + 1303034.

It is an arithmetic number, because the mean of its divisors is an integer number (54684308994).

Almost surely, 2^218734720079 is an apocalyptic number.

218734720079 is a deficient number, since it is larger than the sum of its proper divisors (2515897).

218734720079 is an equidigital number, since it uses as much as digits as its factorization.

218734720079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515896.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 218734720079 in words is "two hundred eighteen billion, seven hundred thirty-four million, seven hundred twenty thousand, seventy-nine".