66663490 has 16 divisors (see below), whose sum is σ = 120087360. Its totient is φ = 26644720.

The previous prime is 66663481. The next prime is 66663491. The reversal of 66663490 is 9436666.

66663490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66663491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23235 + ... + 25945.

It is an arithmetic number, because the mean of its divisors is an integer number (7505460).

Almost surely, 2^66663490 is an apocalyptic number.

66663490 is a deficient number, since it is larger than the sum of its proper divisors (53423870).

66663490 is a wasteful number, since it uses less digits than its factorization.

66663490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 66663490 is about 8164.7712766495. The cubic root of 66663490 is about 405.4736925598.

The spelling of 66663490 in words is "sixty-six million, six hundred sixty-three thousand, four hundred ninety".