66521602105 has 8 divisors (see below), whose sum is σ = 91229625792. Its totient is φ = 45614812848.

The previous prime is 66521602067. The next prime is 66521602117. The reversal of 66521602105 is 50120612566.

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 66521602105 - 2⁹ = 66521601593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950308567 + ... + 950308636.

It is an arithmetic number, because the mean of its divisors is an integer number (11403703224).

Almost surely, 2^66521602105 is an apocalyptic number.

It is an amenable number.

66521602105 is a deficient number, since it is larger than the sum of its proper divisors (24708023687).

66521602105 is a wasteful number, since it uses less digits than its factorization.

66521602105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900617215.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 66521602105 in words is "sixty-six billion, five hundred twenty-one million, six hundred two thousand, one hundred five".