66155147 has 8 divisors (see below), whose sum is σ = 68382720. Its totient is φ = 63933480.

The previous prime is 66155137. The next prime is 66155191. The reversal of 66155147 is 74155166.

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 66155147 - 2²⁰ = 65106571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66155137) 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, 43868 + ... + 45350.

It is an arithmetic number, because the mean of its divisors is an integer number (8547840).

Almost surely, 2^66155147 is an apocalyptic number.

66155147 is a deficient number, since it is larger than the sum of its proper divisors (2227573).

66155147 is a wasteful number, since it uses less digits than its factorization.

66155147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953.

The product of its digits is 25200, while the sum is 35.

The square root of 66155147 is about 8133.5814374727. The cubic root of 66155147 is about 404.4404139905.

The spelling of 66155147 in words is "sixty-six million, one hundred fifty-five thousand, one hundred forty-seven".