66440145 has 8 divisors (see below), whose sum is σ = 106304256. Its totient is φ = 35434736.

The previous prime is 66440137. The next prime is 66440173. The reversal of 66440145 is 54104466.

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

It is a cyclic number.

It is not a de Polignac number, because 66440145 - 2³ = 66440137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214657 + ... + 2214686.

It is an arithmetic number, because the mean of its divisors is an integer number (13288032).

Almost surely, 2^66440145 is an apocalyptic number.

It is an amenable number.

66440145 is a deficient number, since it is larger than the sum of its proper divisors (39864111).

66440145 is a wasteful number, since it uses less digits than its factorization.

66440145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429351.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 66440145 is about 8151.0824434550. The cubic root of 66440145 is about 405.0203617259.

The spelling of 66440145 in words is "sixty-six million, four hundred forty thousand, one hundred forty-five".