66536217 has 24 divisors (see below), whose sum is σ = 109407168. Its totient is φ = 38570400.

The previous prime is 66536207. The next prime is 66536221. The reversal of 66536217 is 71263566.

It is not a de Polignac number, because 66536217 - 2⁷ = 66536089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66536207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12334 + ... + 16887.

It is an arithmetic number, because the mean of its divisors is an integer number (4558632).

Almost surely, 2^66536217 is an apocalyptic number.

It is an amenable number.

66536217 is a deficient number, since it is larger than the sum of its proper divisors (42870951).

66536217 is a wasteful number, since it uses less digits than its factorization.

66536217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29261 (or 29258 counting only the distinct ones).

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

The square root of 66536217 is about 8156.9735196334. The cubic root of 66536217 is about 405.2154866069.

The spelling of 66536217 in words is "sixty-six million, five hundred thirty-six thousand, two hundred seventeen".