67138666 has 16 divisors (see below), whose sum is σ = 121152960. Its totient is φ = 27259200.

The previous prime is 67138619. The next prime is 67138697. The reversal of 67138666 is 66683176.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125935 + ... + 126466.

It is an arithmetic number, because the mean of its divisors is an integer number (7572060).

Almost surely, 2^67138666 is an apocalyptic number.

67138666 is a deficient number, since it is larger than the sum of its proper divisors (54014294).

67138666 is a wasteful number, since it uses less digits than its factorization.

67138666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252429.

The product of its digits is 217728, while the sum is 43.

The square root of 67138666 is about 8193.8187678274. The cubic root of 67138666 is about 406.4348152860.

The spelling of 67138666 in words is "sixty-seven million, one hundred thirty-eight thousand, six hundred sixty-six".