3665240281 has 4 divisors (see below), whose sum is σ = 3734395812. Its totient is φ = 3596084752.

The previous prime is 3665240263. The next prime is 3665240287. The reversal of 3665240281 is 1820425663.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1925015625 + 1740224656 = 43875^2 + 41716^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665240281 - 2¹³ = 3665232089 is a prime.

It is a super-2 number, since 2×3665240281² = 26867972634929917922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3665240281.

It is not an unprimeable number, because it can be changed into a prime (3665240287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34577686 + ... + 34577791.

It is an arithmetic number, because the mean of its divisors is an integer number (933598953).

Almost surely, 2^3665240281 is an apocalyptic number.

It is an amenable number.

3665240281 is a deficient number, since it is larger than the sum of its proper divisors (69155531).

3665240281 is an equidigital number, since it uses as much as digits as its factorization.

3665240281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69155530.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 3665240281 is about 60541.2279442695. The cubic root of 3665240281 is about 1541.8216876473.

The spelling of 3665240281 in words is "three billion, six hundred sixty-five million, two hundred forty thousand, two hundred eighty-one".