66782285649 has 32 divisors (see below), whose sum is σ = 103139527680. Its totient is φ = 42658704000.

The previous prime is 66782285627. The next prime is 66782285671. The reversal of 66782285649 is 94658228766.

66782285649 is a `hidden beast` number, since 6 + 67 + 8 + 2 + 2 + 8 + 564 + 9 = 666.

66782285649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66782285627) and next prime (66782285671).

It is not a de Polignac number, because 66782285649 - 2⁹ = 66782285137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66782275649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310452 + ... + 479525.

It is an arithmetic number, because the mean of its divisors is an integer number (3223110240).

Almost surely, 2^66782285649 is an apocalyptic number.

It is an amenable number.

66782285649 is a deficient number, since it is larger than the sum of its proper divisors (36357242031).

66782285649 is a wasteful number, since it uses less digits than its factorization.

66782285649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790118 (or 790112 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 66782285649 in words is "sixty-six billion, seven hundred eighty-two million, two hundred eighty-five thousand, six hundred forty-nine".