216351655 has 8 divisors (see below), whose sum is σ = 279592992. Its totient is φ = 159767328.

The previous prime is 216351647. The next prime is 216351659. The reversal of 216351655 is 556153612.

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 216351655 - 2³ = 216351647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216351655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216351659) 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, 1664179 + ... + 1664308.

It is an arithmetic number, because the mean of its divisors is an integer number (34949124).

Almost surely, 2^216351655 is an apocalyptic number.

216351655 is a deficient number, since it is larger than the sum of its proper divisors (63241337).

216351655 is a wasteful number, since it uses less digits than its factorization.

216351655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328505.

The product of its digits is 27000, while the sum is 34.

The square root of 216351655 is about 14708.8971374471. The cubic root of 216351655 is about 600.3254299418.

The spelling of 216351655 in words is "two hundred sixteen million, three hundred fifty-one thousand, six hundred fifty-five".