216306651 has 16 divisors (see below), whose sum is σ = 328308480. Its totient is φ = 125394720.

The previous prime is 216306631. The next prime is 216306653. The reversal of 216306651 is 156603612.

It is not a de Polignac number, because 216306651 - 2⁷ = 216306523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216306653) 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, 141736 + ... + 143253.

It is an arithmetic number, because the mean of its divisors is an integer number (20519280).

Almost surely, 2^216306651 is an apocalyptic number.

216306651 is a deficient number, since it is larger than the sum of its proper divisors (112001829).

216306651 is a wasteful number, since it uses less digits than its factorization.

216306651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285026.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 216306651 is about 14707.3672355048. The cubic root of 216306651 is about 600.2838018508.

The spelling of 216306651 in words is "two hundred sixteen million, three hundred six thousand, six hundred fifty-one".