216720717239 has 4 divisors (see below), whose sum is σ = 233391541656. Its totient is φ = 200049892824.

The previous prime is 216720717229. The next prime is 216720717251. The reversal of 216720717239 is 932717027612.

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

It is a cyclic number.

It is not a de Polignac number, because 216720717239 - 2³⁶ = 148001240503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216720717193 and 216720717202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216720717209) 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, 8335412189 + ... + 8335412214.

It is an arithmetic number, because the mean of its divisors is an integer number (58347885414).

Almost surely, 2^216720717239 is an apocalyptic number.

216720717239 is a deficient number, since it is larger than the sum of its proper divisors (16670824417).

216720717239 is a wasteful number, since it uses less digits than its factorization.

216720717239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16670824416.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 216720717239 in words is "two hundred sixteen billion, seven hundred twenty million, seven hundred seventeen thousand, two hundred thirty-nine".