66523144 has 8 divisors (see below), whose sum is σ = 124730910. Its totient is φ = 33261568.

The previous prime is 66523141. The next prime is 66523169. The reversal of 66523144 is 44132566.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 2683044 = 7990^2 + 1638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66523141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4157689 + ... + 4157704.

Almost surely, 2^66523144 is an apocalyptic number.

It is an amenable number.

66523144 is a deficient number, since it is larger than the sum of its proper divisors (58207766).

66523144 is a wasteful number, since it uses less digits than its factorization.

66523144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8315399 (or 8315395 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 66523144 is about 8156.1721413908. The cubic root of 66523144 is about 405.1889460286.

The spelling of 66523144 in words is "sixty-six million, five hundred twenty-three thousand, one hundred forty-four".