66755139 has 8 divisors (see below), whose sum is σ = 97098432. Its totient is φ = 40457640.

The previous prime is 66755099. The next prime is 66755149. The reversal of 66755139 is 93155766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66755139 - 2⁹ = 66754627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66755139.

It is not an unprimeable number, because it can be changed into a prime (66755149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011409 + ... + 1011474.

It is an arithmetic number, because the mean of its divisors is an integer number (12137304).

Almost surely, 2^66755139 is an apocalyptic number.

66755139 is a deficient number, since it is larger than the sum of its proper divisors (30343293).

66755139 is a wasteful number, since it uses less digits than its factorization.

66755139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022897.

The product of its digits is 170100, while the sum is 42.

The square root of 66755139 is about 8170.3818148236. The cubic root of 66755139 is about 405.6594226182.

It can be divided in two parts, 667551 and 39, that added together give a triangular number (667590 = T₁₁₅₅).

The spelling of 66755139 in words is "sixty-six million, seven hundred fifty-five thousand, one hundred thirty-nine".