216351663 has 8 divisors (see below), whose sum is σ = 314693376. Its totient is φ = 131122200.

The previous prime is 216351661. The next prime is 216351713. The reversal of 216351663 is 366153612.

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

It is not a de Polignac number, because 216351663 - 2¹ = 216351661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 6556111 = 216351663 / (2 + 1 + 6 + 3 + 5 + 1 + 6 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216351661) 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, 3278023 + ... + 3278088.

It is an arithmetic number, because the mean of its divisors is an integer number (39336672).

Almost surely, 2^216351663 is an apocalyptic number.

216351663 is a deficient number, since it is larger than the sum of its proper divisors (98341713).

216351663 is a wasteful number, since it uses less digits than its factorization.

216351663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556125.

The product of its digits is 19440, while the sum is 33.

The square root of 216351663 is about 14708.8974093914. The cubic root of 216351663 is about 600.3254373412.

The spelling of 216351663 in words is "two hundred sixteen million, three hundred fifty-one thousand, six hundred sixty-three".