66445646 has 8 divisors (see below), whose sum is σ = 100280424. Its totient is φ = 33018840.

The previous prime is 66445627. The next prime is 66445649. The reversal of 66445646 is 64654466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×66445646³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66445649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101585 + ... + 102236.

It is an arithmetic number, because the mean of its divisors is an integer number (12535053).

Almost surely, 2^66445646 is an apocalyptic number.

66445646 is a deficient number, since it is larger than the sum of its proper divisors (33834778).

66445646 is a wasteful number, since it uses less digits than its factorization.

66445646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203986.

The product of its digits is 414720, while the sum is 41.

The square root of 66445646 is about 8151.4198763160. The cubic root of 66445646 is about 405.0315394835.

The spelling of 66445646 in words is "sixty-six million, four hundred forty-five thousand, six hundred forty-six".