216606537 has 48 divisors (see below), whose sum is σ = 380540160. Its totient is φ = 115900416.

The previous prime is 216606499. The next prime is 216606541. The reversal of 216606537 is 735606612.

216606537 is a `hidden beast` number, since 2 + 16 + 606 + 5 + 37 = 666.

216606537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216606537 - 2⁸ = 216606281 is a prime.

It is a super-2 number, since 2×216606537² = 93836783742264738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216606557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281289 + ... + 282057.

It is an arithmetic number, because the mean of its divisors is an integer number (7927920).

Almost surely, 2^216606537 is an apocalyptic number.

It is an amenable number.

216606537 is a deficient number, since it is larger than the sum of its proper divisors (163933623).

216606537 is a wasteful number, since it uses less digits than its factorization.

216606537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 216606537 is about 14717.5587989313. The cubic root of 216606537 is about 600.5610834787.

The spelling of 216606537 in words is "two hundred sixteen million, six hundred six thousand, five hundred thirty-seven".