66074521 has 4 divisors (see below), whose sum is σ = 66092032. Its totient is φ = 66057012.

The previous prime is 66074483. The next prime is 66074537. The reversal of 66074521 is 12547066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66074521 - 2¹¹ = 66072473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66074321) 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, 501 + ... + 11506.

It is an arithmetic number, because the mean of its divisors is an integer number (16523008).

Almost surely, 2^66074521 is an apocalyptic number.

It is an amenable number.

66074521 is a deficient number, since it is larger than the sum of its proper divisors (17511).

66074521 is a wasteful number, since it uses less digits than its factorization.

66074521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17510.

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

The square root of 66074521 is about 8128.6235612187. The cubic root of 66074521 is about 404.2760444726.

The spelling of 66074521 in words is "sixty-six million, seventy-four thousand, five hundred twenty-one".