66499678 has 16 divisors (see below), whose sum is σ = 114144480. Its totient is φ = 28463616.

The previous prime is 66499651. The next prime is 66499687. The reversal of 66499678 is 87699466.

It is a congruent number.

It is an unprimeable number.

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, 10450 + ... + 15562.

It is an arithmetic number, because the mean of its divisors is an integer number (7134030).

Almost surely, 2^66499678 is an apocalyptic number.

66499678 is a deficient number, since it is larger than the sum of its proper divisors (47644802).

66499678 is a wasteful number, since it uses less digits than its factorization.

66499678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051.

The product of its digits is 3919104, while the sum is 55.

The square root of 66499678 is about 8154.7334720394. The cubic root of 66499678 is about 405.1412970378.

The spelling of 66499678 in words is "sixty-six million, four hundred ninety-nine thousand, six hundred seventy-eight".