138666695 has 8 divisors (see below), whose sum is σ = 166588944. Its totient is φ = 110807424.

The previous prime is 138666683. The next prime is 138666721. The reversal of 138666695 is 596666831.

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 138666695 - 2⁴ = 138666679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 10754 + ... + 19823.

It is an arithmetic number, because the mean of its divisors is an integer number (20823618).

Almost surely, 2^138666695 is an apocalyptic number.

138666695 is a deficient number, since it is larger than the sum of its proper divisors (27922249).

138666695 is an equidigital number, since it uses as much as digits as its factorization.

138666695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31489.

The product of its digits is 1399680, while the sum is 50.

The square root of 138666695 is about 11775.6823581481. The cubic root of 138666695 is about 517.5957736967.

The spelling of 138666695 in words is "one hundred thirty-eight million, six hundred sixty-six thousand, six hundred ninety-five".