66100510066 has 24 divisors (see below), whose sum is σ = 110799425340. Its totient is φ = 29468952576.

The previous prime is 66100510061. The next prime is 66100510093. The reversal of 66100510066 is 66001500166.

It can be written as a sum of positive squares in 2 ways, for example, as 60774575625 + 5325934441 = 246525^2 + 72979^2 .

It is not an unprimeable number, because it can be changed into a prime (66100510061) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2680431 + ... + 2704978.

Almost surely, 2^66100510066 is an apocalyptic number.

66100510066 is a deficient number, since it is larger than the sum of its proper divisors (44698915274).

66100510066 is a wasteful number, since it uses less digits than its factorization.

66100510066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385466 (or 5385447 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 66100510066 in words is "sixty-six billion, one hundred million, five hundred ten thousand, sixty-six".