216011660 has 24 divisors (see below), whose sum is σ = 453932640. Its totient is φ = 86345984.

The previous prime is 216011557. The next prime is 216011669. The reversal of 216011660 is 66110612.

It is a super-2 number, since 2×216011660² = 93322074511911200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216011669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38132 + ... + 43428.

It is an arithmetic number, because the mean of its divisors is an integer number (18913860).

Almost surely, 2^216011660 is an apocalyptic number.

216011660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216011660 is an abundant number, since it is smaller than the sum of its proper divisors (237920980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216011660 is a wasteful number, since it uses less digits than its factorization.

216011660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345 (or 7343 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 216011660 is about 14697.3351326014. The cubic root of 216011660 is about 600.0107961020.

The spelling of 216011660 in words is "two hundred sixteen million, eleven thousand, six hundred sixty".