66699299666 has 8 divisors (see below), whose sum is σ = 100050047100. Its totient is φ = 33349283968.

The previous prime is 66699299659. The next prime is 66699299677.

66699299666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 66424237441 + 275062225 = 257729^2 + 16585^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 66699299593 and 66699299602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247610 + ... + 441258.

Almost surely, 2^66699299666 is an apocalyptic number.

66699299666 is a deficient number, since it is larger than the sum of its proper divisors (33350747434).

66699299666 is a wasteful number, since it uses less digits than its factorization.

66699299666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365868.

The product of its digits is 612220032, while the sum is 74.

The spelling of 66699299666 in words is "sixty-six billion, six hundred ninety-nine million, two hundred ninety-nine thousand, six hundred sixty-six".