66572145 has 16 divisors (see below), whose sum is σ = 118350720. Its totient is φ = 35505072.

The previous prime is 66572141. The next prime is 66572171. The reversal of 66572145 is 54127566.

It is a happy number.

It is not a de Polignac number, because 66572145 - 2² = 66572141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66572141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246429 + ... + 246698.

It is an arithmetic number, because the mean of its divisors is an integer number (7396920).

Almost surely, 2^66572145 is an apocalyptic number.

It is an amenable number.

66572145 is a deficient number, since it is larger than the sum of its proper divisors (51778575).

66572145 is a wasteful number, since it uses less digits than its factorization.

66572145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493141 (or 493135 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 66572145 is about 8159.1755098172. The cubic root of 66572145 is about 405.2884091095.

The spelling of 66572145 in words is "sixty-six million, five hundred seventy-two thousand, one hundred forty-five".