66890559 has 8 divisors (see below), whose sum is σ = 92262960. Its totient is φ = 43055936.

The previous prime is 66890539. The next prime is 66890573. The reversal of 66890559 is 95509866.

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 66890559 - 2¹¹ = 66888511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66890539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384342 + ... + 384515.

It is an arithmetic number, because the mean of its divisors is an integer number (11532870).

Almost surely, 2^66890559 is an apocalyptic number.

66890559 is a deficient number, since it is larger than the sum of its proper divisors (25372401).

66890559 is a wasteful number, since it uses less digits than its factorization.

66890559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768889.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 66890559 is about 8178.6648665904. The cubic root of 66890559 is about 405.9335453043.

The spelling of 66890559 in words is "sixty-six million, eight hundred ninety thousand, five hundred fifty-nine".