66528705 has 16 divisors (see below), whose sum is σ = 106928640. Its totient is φ = 35321088.

The previous prime is 66528703. The next prime is 66528713. The reversal of 66528705 is 50782566.

It is a happy number.

It is not a de Polignac number, because 66528705 - 2¹ = 66528703 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66528703) 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, 6600 + ... + 13289.

It is an arithmetic number, because the mean of its divisors is an integer number (6683040).

Almost surely, 2^66528705 is an apocalyptic number.

It is an amenable number.

66528705 is a deficient number, since it is larger than the sum of its proper divisors (40399935).

66528705 is a wasteful number, since it uses less digits than its factorization.

66528705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20120.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 66528705 is about 8156.5130417354. The cubic root of 66528705 is about 405.2002362995.

The spelling of 66528705 in words is "sixty-six million, five hundred twenty-eight thousand, seven hundred five".