66305645 has 16 divisors (see below), whose sum is σ = 91112448. Its totient is φ = 45377280.

The previous prime is 66305639. The next prime is 66305677. The reversal of 66305645 is 54650366.

It is not a de Polignac number, because 66305645 - 2⁶ = 66305581 is a prime.

It is a super-3 number, since 3×66305645³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19685 + ... + 22805.

It is an arithmetic number, because the mean of its divisors is an integer number (5694528).

Almost surely, 2^66305645 is an apocalyptic number.

It is an amenable number.

66305645 is a deficient number, since it is larger than the sum of its proper divisors (24806803).

66305645 is a wasteful number, since it uses less digits than its factorization.

66305645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66305645 is about 8142.8278257618. The cubic root of 66305645 is about 404.7468722588.

The spelling of 66305645 in words is "sixty-six million, three hundred five thousand, six hundred forty-five".