66505650511066 has 8 divisors (see below), whose sum is σ = 107432204671764. Its totient is φ = 30694915620480.

The previous prime is 66505650511051. The next prime is 66505650511103. The reversal of 66505650511066 is 66011505650566.

It can be written as a sum of positive squares in 2 ways, for example, as 66401653935841 + 103996575225 = 8148721^2 + 322485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278954817495 + ... + 1278954817546.

Almost surely, 2^{66505650511066} is an apocalyptic number.

66505650511066 is a deficient number, since it is larger than the sum of its proper divisors (40926554160698).

66505650511066 is a wasteful number, since it uses less digits than its factorization.

66505650511066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557909635056.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 66505650511066 in words is "sixty-six trillion, five hundred five billion, six hundred fifty million, five hundred eleven thousand, sixty-six".