66155155 has 16 divisors (see below), whose sum is σ = 87794784. Its totient is φ = 47450880.

The previous prime is 66155137. The next prime is 66155191. The reversal of 66155155 is 55155166.

It is not a de Polignac number, because 66155155 - 2¹⁵ = 66122387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66155155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4224 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (5487174).

Almost surely, 2^66155155 is an apocalyptic number.

66155155 is a deficient number, since it is larger than the sum of its proper divisors (21639629).

66155155 is a wasteful number, since it uses less digits than its factorization.

66155155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16566.

The product of its digits is 22500, while the sum is 34.

The square root of 66155155 is about 8133.5819292609. The cubic root of 66155155 is about 404.4404302932.

The spelling of 66155155 in words is "sixty-six million, one hundred fifty-five thousand, one hundred fifty-five".