216687032309 has 8 divisors (see below), whose sum is σ = 237951324480. Its totient is φ = 195683652000.

The previous prime is 216687032281. The next prime is 216687032381. The reversal of 216687032309 is 903230786612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216687032309 - 2²⁴ = 216670255093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216687032209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65226224 + ... + 65229545.

It is an arithmetic number, because the mean of its divisors is an integer number (29743915560).

Almost surely, 2^216687032309 is an apocalyptic number.

It is an amenable number.

216687032309 is a deficient number, since it is larger than the sum of its proper divisors (21264292171).

216687032309 is a wasteful number, since it uses less digits than its factorization.

216687032309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130455931.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 216687032309 in words is "two hundred sixteen billion, six hundred eighty-seven million, thirty-two thousand, three hundred nine".