2066659999 has 4 divisors (see below), whose sum is σ = 2073305520. Its totient is φ = 2060014480.

The previous prime is 2066659993. The next prime is 2066660017. The reversal of 2066659999 is 9999566602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2066659999 - 2¹⁵ = 2066627231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066659993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3322294 + ... + 3322915.

It is an arithmetic number, because the mean of its divisors is an integer number (518326380).

Almost surely, 2^2066659999 is an apocalyptic number.

2066659999 is a deficient number, since it is larger than the sum of its proper divisors (6645521).

2066659999 is an equidigital number, since it uses as much as digits as its factorization.

2066659999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6645520.

The product of its (nonzero) digits is 14171760, while the sum is 61.

The square root of 2066659999 is about 45460.5323220043. The cubic root of 2066659999 is about 1273.7660750060.

The spelling of 2066659999 in words is "two billion, sixty-six million, six hundred fifty-nine thousand, nine hundred ninety-nine".