66572144 has 20 divisors (see below), whose sum is σ = 129110040. Its totient is φ = 33253440.

The previous prime is 66572141. The next prime is 66572171. The reversal of 66572144 is 44127566.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31142 + ... + 33210.

It is an arithmetic number, because the mean of its divisors is an integer number (6455502).

Almost surely, 2^66572144 is an apocalyptic number.

It is an amenable number.

66572144 is a deficient number, since it is larger than the sum of its proper divisors (62537896).

66572144 is a wasteful number, since it uses less digits than its factorization.

66572144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4082 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 66572144 is about 8159.1754485365. The cubic root of 66572144 is about 405.2884070801.

The spelling of 66572144 in words is "sixty-six million, five hundred seventy-two thousand, one hundred forty-four".