66272521 has 8 divisors (see below), whose sum is σ = 75859904. Its totient is φ = 56715120.

The previous prime is 66272519. The next prime is 66272543. The reversal of 66272521 is 12527266.

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

It is not a de Polignac number, because 66272521 - 2¹ = 66272519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66272621) 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, 2535 + ... + 11788.

It is an arithmetic number, because the mean of its divisors is an integer number (9482488).

Almost surely, 2^66272521 is an apocalyptic number.

It is an amenable number.

66272521 is a deficient number, since it is larger than the sum of its proper divisors (9587383).

66272521 is a wasteful number, since it uses less digits than its factorization.

66272521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14991.

The product of its digits is 10080, while the sum is 31.

The square root of 66272521 is about 8140.7936345297. The cubic root of 66272521 is about 404.6794618668.

Adding to 66272521 its reverse (12527266), we get a palindrome (78799787).

The spelling of 66272521 in words is "sixty-six million, two hundred seventy-two thousand, five hundred twenty-one".