66144521 has 8 divisors (see below), whose sum is σ = 68296704. Its totient is φ = 64018080.

The previous prime is 66144509. The next prime is 66144541. The reversal of 66144521 is 12544166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66144521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66144541) 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, 1145 + ... + 11558.

It is an arithmetic number, because the mean of its divisors is an integer number (8537088).

Almost surely, 2^66144521 is an apocalyptic number.

It is an amenable number.

66144521 is a deficient number, since it is larger than the sum of its proper divisors (2152183).

66144521 is a wasteful number, since it uses less digits than its factorization.

66144521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12871.

The product of its digits is 5760, while the sum is 29.

The square root of 66144521 is about 8132.9281934614. The cubic root of 66144521 is about 404.4187587646.

Adding to 66144521 its reverse (12544166), we get a palindrome (78688687).

The spelling of 66144521 in words is "sixty-six million, one hundred forty-four thousand, five hundred twenty-one".