66650521 has 8 divisors (see below), whose sum is σ = 77609664. Its totient is φ = 56050800.

The previous prime is 66650513. The next prime is 66650593. The reversal of 66650521 is 12505666.

66650521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66650521 - 2³ = 66650513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66650501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89455 + ... + 90196.

It is an arithmetic number, because the mean of its divisors is an integer number (9701208).

Almost surely, 2^66650521 is an apocalyptic number.

It is an amenable number.

66650521 is a deficient number, since it is larger than the sum of its proper divisors (10959143).

66650521 is a wasteful number, since it uses less digits than its factorization.

66650521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179711.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 66650521 is about 8163.9770332847. The cubic root of 66650521 is about 405.4473966600.

The spelling of 66650521 in words is "sixty-six million, six hundred fifty thousand, five hundred twenty-one".