216488061 has 12 divisors (see below), whose sum is σ = 315575260. Its totient is φ = 143000640.

The previous prime is 216488057. The next prime is 216488087. The reversal of 216488061 is 160884612.

216488061 is a `hidden beast` number, since 2 + 1 + 648 + 8 + 0 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 165636900 + 50851161 = 12870^2 + 7131^2 .

It is not a de Polignac number, because 216488061 - 2² = 216488057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216488011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109360 + ... + 111321.

Almost surely, 2^216488061 is an apocalyptic number.

It is an amenable number.

216488061 is a deficient number, since it is larger than the sum of its proper divisors (99087199).

216488061 is a wasteful number, since it uses less digits than its factorization.

216488061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220796 (or 220793 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 216488061 is about 14713.5332602336. The cubic root of 216488061 is about 600.4515683914.

The spelling of 216488061 in words is "two hundred sixteen million, four hundred eighty-eight thousand, sixty-one".