66409532489 has 4 divisors (see below), whose sum is σ = 66414662160. Its totient is φ = 66404402820.

The previous prime is 66409532477. The next prime is 66409532503. The reversal of 66409532489 is 98423590466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66409532489 - 2¹⁶ = 66409466953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66409532429) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2545367 + ... + 2571324.

It is an arithmetic number, because the mean of its divisors is an integer number (16603665540).

Almost surely, 2^66409532489 is an apocalyptic number.

It is an amenable number.

66409532489 is a deficient number, since it is larger than the sum of its proper divisors (5129671).

66409532489 is a wasteful number, since it uses less digits than its factorization.

66409532489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129670.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 66409532489 in words is "sixty-six billion, four hundred nine million, five hundred thirty-two thousand, four hundred eighty-nine".