66520349 has 8 divisors (see below), whose sum is σ = 80024640. Its totient is φ = 54016416.

The previous prime is 66520331. The next prime is 66520351. The reversal of 66520349 is 94302566.

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 66520349 - 2²⁰ = 65471773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520319) 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, 249944 + ... + 250209.

It is an arithmetic number, because the mean of its divisors is an integer number (10003080).

Almost surely, 2^66520349 is an apocalyptic number.

It is an amenable number.

66520349 is a deficient number, since it is larger than the sum of its proper divisors (13504291).

66520349 is a wasteful number, since it uses less digits than its factorization.

66520349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500179.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66520349 is about 8156.0007969593. Note that the first 3 decimals coincide. The cubic root of 66520349 is about 405.1832712168.

The spelling of 66520349 in words is "sixty-six million, five hundred twenty thousand, three hundred forty-nine".