2666442385 has 4 divisors (see below), whose sum is σ = 3199730868. Its totient is φ = 2133153904.

The previous prime is 2666442379. The next prime is 2666442391. The reversal of 2666442385 is 5832446662.

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

It is an interprime number because it is at equal distance from previous prime (2666442379) and next prime (2666442391).

It can be written as a sum of positive squares in 2 ways, for example, as 1946486161 + 719956224 = 44119^2 + 26832^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666442385 - 2¹⁷ = 2666311313 is a prime.

It is a Duffinian number.

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, 266644234 + ... + 266644243.

It is an arithmetic number, because the mean of its divisors is an integer number (799932717).

Almost surely, 2^2666442385 is an apocalyptic number.

It is an amenable number.

2666442385 is a deficient number, since it is larger than the sum of its proper divisors (533288483).

2666442385 is an equidigital number, since it uses as much as digits as its factorization.

2666442385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533288482.

The product of its digits is 1658880, while the sum is 46.

The square root of 2666442385 is about 51637.6063058698. The cubic root of 2666442385 is about 1386.6836705557.

The spelling of 2666442385 in words is "two billion, six hundred sixty-six million, four hundred forty-two thousand, three hundred eighty-five".