216064651 has 4 divisors (see below), whose sum is σ = 235706904. Its totient is φ = 196422400.

The previous prime is 216064649. The next prime is 216064657. The reversal of 216064651 is 156460612.

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 216064651 - 2¹ = 216064649 is a prime.

It is a super-3 number, since 3×216064651³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216064657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9821110 + ... + 9821131.

It is an arithmetic number, because the mean of its divisors is an integer number (58926726).

Almost surely, 2^216064651 is an apocalyptic number.

216064651 is a deficient number, since it is larger than the sum of its proper divisors (19642253).

216064651 is a wasteful number, since it uses less digits than its factorization.

216064651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19642252.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 216064651 is about 14699.1377638282. The cubic root of 216064651 is about 600.0598560656.

The spelling of 216064651 in words is "two hundred sixteen million, sixty-four thousand, six hundred fifty-one".