66800006669 has 16 divisors (see below), whose sum is σ = 77169153600. Its totient is φ = 57147836160.

The previous prime is 66800006659. The next prime is 66800006671. The reversal of 66800006669 is 96660000866.

It is a cyclic number.

It is not a de Polignac number, because 66800006669 - 2⁴ = 66800006653 is a prime.

It is a super-2 number, since 2×66800006669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66800006629) 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, 1882907 + ... + 1918055.

It is an arithmetic number, because the mean of its divisors is an integer number (4823072100).

Almost surely, 2^66800006669 is an apocalyptic number.

It is an amenable number.

66800006669 is a deficient number, since it is larger than the sum of its proper divisors (10369146931).

66800006669 is a wasteful number, since it uses less digits than its factorization.

66800006669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45340.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 66800006669 in words is "sixty-six billion, eight hundred million, six thousand, six hundred sixty-nine".