66489999 has 8 divisors (see below), whose sum is σ = 91049520. Its totient is φ = 43128576.

The previous prime is 66489989. The next prime is 66490013. The reversal of 66489999 is 99998466.

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

It is not a de Polignac number, because 66489999 - 2⁸ = 66489743 is a prime.

66489999 is a modest number, since divided by 9999 gives 6648 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66489919) 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 7 ways as a sum of consecutive naturals, for example, 299394 + ... + 299615.

It is an arithmetic number, because the mean of its divisors is an integer number (11381190).

Almost surely, 2^66489999 is an apocalyptic number.

66489999 is a deficient number, since it is larger than the sum of its proper divisors (24559521).

66489999 is a wasteful number, since it uses less digits than its factorization.

66489999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599049.

The product of its digits is 7558272, while the sum is 60.

The square root of 66489999 is about 8154.1399914399. The cubic root of 66489999 is about 405.1216400360.

The spelling of 66489999 in words is "sixty-six million, four hundred eighty-nine thousand, nine hundred ninety-nine".