66520626 has 32 divisors (see below), whose sum is σ = 141766848. Its totient is φ = 20736000.

The previous prime is 66520591. The next prime is 66520627. The reversal of 66520626 is 62602566.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66520627) 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, 14626 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (4430214).

Almost surely, 2^66520626 is an apocalyptic number.

66520626 is an abundant number, since it is smaller than the sum of its proper divisors (75246222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66520626 is a wasteful number, since it uses less digits than its factorization.

66520626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 66520626 is about 8156.0177783033. The cubic root of 66520626 is about 405.1838336292.

The spelling of 66520626 in words is "sixty-six million, five hundred twenty thousand, six hundred twenty-six".