66155145 has 24 divisors (see below), whose sum is σ = 123130944. Its totient is φ = 30242016.

The previous prime is 66155137. The next prime is 66155191. The reversal of 66155145 is 54155166.

It is not a de Polignac number, because 66155145 - 2³ = 66155137 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44269 + ... + 45738.

It is an arithmetic number, because the mean of its divisors is an integer number (5130456).

Almost surely, 2^66155145 is an apocalyptic number.

It is an amenable number.

66155145 is a deficient number, since it is larger than the sum of its proper divisors (56975799).

66155145 is a wasteful number, since it uses less digits than its factorization.

66155145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90029 (or 90022 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 66155145 is about 8133.5813145256. The cubic root of 66155145 is about 404.4404099148.

The spelling of 66155145 in words is "sixty-six million, one hundred fifty-five thousand, one hundred forty-five".