66614521 has 8 divisors (see below), whose sum is σ = 67130784. Its totient is φ = 66100800.

The previous prime is 66614519. The next prime is 66614531. The reversal of 66614521 is 12541666.

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 66614521 - 2¹ = 66614519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66614531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113190 + ... + 113776.

It is an arithmetic number, because the mean of its divisors is an integer number (8391348).

Almost surely, 2^66614521 is an apocalyptic number.

It is an amenable number.

66614521 is a deficient number, since it is larger than the sum of its proper divisors (516263).

66614521 is a wasteful number, since it uses less digits than its factorization.

66614521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 8640, while the sum is 31.

The square root of 66614521 is about 8161.7719277128. The cubic root of 66614521 is about 405.3743853027.

The spelling of 66614521 in words is "sixty-six million, six hundred fourteen thousand, five hundred twenty-one".