66144253 has 8 divisors (see below), whose sum is σ = 75934208. Its totient is φ = 56439504.

The previous prime is 66144241. The next prime is 66144289. The reversal of 66144253 is 35244166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66144253 - 2⁹ = 66143741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66144223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19626 + ... + 22747.

It is an arithmetic number, because the mean of its divisors is an integer number (9491776).

Almost surely, 2^66144253 is an apocalyptic number.

It is an amenable number.

66144253 is a deficient number, since it is larger than the sum of its proper divisors (9789955).

66144253 is a wasteful number, since it uses less digits than its factorization.

66144253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42603.

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

The square root of 66144253 is about 8132.9117172142. The cubic root of 66144253 is about 404.4182125648.

The spelling of 66144253 in words is "sixty-six million, one hundred forty-four thousand, two hundred fifty-three".