66223215 has 24 divisors (see below), whose sum is σ = 115144848. Its totient is φ = 35208960.

The previous prime is 66223207. The next prime is 66223219. The reversal of 66223215 is 51232266.

66223215 is a `hidden beast` number, since 6 + 622 + 32 + 1 + 5 = 666.

It is not a de Polignac number, because 66223215 - 2³ = 66223207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223219) 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, 13495 + ... + 17735.

It is an arithmetic number, because the mean of its divisors is an integer number (4797702).

Almost surely, 2^66223215 is an apocalyptic number.

66223215 is a deficient number, since it is larger than the sum of its proper divisors (48921633).

66223215 is a wasteful number, since it uses less digits than its factorization.

66223215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599 (or 4596 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 66223215 is about 8137.7647422373. The cubic root of 66223215 is about 404.5790779994.

The spelling of 66223215 in words is "sixty-six million, two hundred twenty-three thousand, two hundred fifteen".