66409144075 has 6 divisors (see below), whose sum is σ = 82347338684. Its totient is φ = 53127315240.

The previous prime is 66409144069. The next prime is 66409144099. The reversal of 66409144075 is 57044190466.

It is not a de Polignac number, because 66409144075 - 2⁷ = 66409143947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1328182857 + ... + 1328182906.

Almost surely, 2^66409144075 is an apocalyptic number.

66409144075 is a deficient number, since it is larger than the sum of its proper divisors (15938194609).

66409144075 is a wasteful number, since it uses less digits than its factorization.

66409144075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656365773 (or 2656365768 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 66409144075 in words is "sixty-six billion, four hundred nine million, one hundred forty-four thousand, seventy-five".