66520006 has 32 divisors (see below), whose sum is σ = 117790272. Its totient is φ = 27578880.

The previous prime is 66520001. The next prime is 66520039. The reversal of 66520006 is 60002566.

It is a super-2 number, since 2×66520006² = 8849822396480072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145330 + ... + 145786.

It is an arithmetic number, because the mean of its divisors is an integer number (3680946).

Almost surely, 2^66520006 is an apocalyptic number.

66520006 is a deficient number, since it is larger than the sum of its proper divisors (51270266).

66520006 is a wasteful number, since it uses less digits than its factorization.

66520006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66520006 is about 8155.9797694698. The cubic root of 66520006 is about 405.1825747978.

The spelling of 66520006 in words is "sixty-six million, five hundred twenty thousand, six".