665992299566 has 16 divisors (see below), whose sum is σ = 1089833827248. Its totient is φ = 302715926400.

The previous prime is 665992299563. The next prime is 665992299587.

665992299566 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665992299493 and 665992299502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665992299563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523286 + ... + 1267206.

It is an arithmetic number, because the mean of its divisors is an integer number (68114614203).

Almost surely, 2^665992299566 is an apocalyptic number.

665992299566 is a deficient number, since it is larger than the sum of its proper divisors (423841527682).

665992299566 is a wasteful number, since it uses less digits than its factorization.

665992299566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784627.

The product of its digits is 850305600, while the sum is 74.

The spelling of 665992299566 in words is "six hundred sixty-five billion, nine hundred ninety-two million, two hundred ninety-nine thousand, five hundred sixty-six".