66220065 has 16 divisors (see below), whose sum is σ = 117724800. Its totient is φ = 35317296.

The previous prime is 66220031. The next prime is 66220069. The reversal of 66220065 is 56002266.

It is not a de Polignac number, because 66220065 - 2¹¹ = 66218017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (66220069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245125 + ... + 245394.

It is an arithmetic number, because the mean of its divisors is an integer number (7357800).

Almost surely, 2^66220065 is an apocalyptic number.

It is an amenable number.

66220065 is a deficient number, since it is larger than the sum of its proper divisors (51504735).

66220065 is a wasteful number, since it uses less digits than its factorization.

66220065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490533 (or 490527 counting only the distinct ones).

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

The square root of 66220065 is about 8137.5711978452. The cubic root of 66220065 is about 404.5726631075.

The spelling of 66220065 in words is "sixty-six million, two hundred twenty thousand, sixty-five".