218339269731509 has 16 divisors (see below), whose sum is σ = 222148735365312. Its totient is φ = 214558214181888.

The previous prime is 218339269731497. The next prime is 218339269731523. The reversal of 218339269731509 is 905137962933812.

It is not a de Polignac number, because 218339269731509 - 2³⁶ = 218270550254773 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 (218339269731109) 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, 104094299 + ... + 106171095.

It is an arithmetic number, because the mean of its divisors is an integer number (13884295960332).

Almost surely, 2^{218339269731509} is an apocalyptic number.

It is an amenable number.

218339269731509 is a deficient number, since it is larger than the sum of its proper divisors (3809465633803).

218339269731509 is a wasteful number, since it uses less digits than its factorization.

218339269731509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083636.

The product of its (nonzero) digits is 132269760, while the sum is 68.

The spelling of 218339269731509 in words is "two hundred eighteen trillion, three hundred thirty-nine billion, two hundred sixty-nine million, seven hundred thirty-one thousand, five hundred nine".