3665139481309 has 8 divisors (see below), whose sum is σ = 3885285451320. Its totient is φ = 3445499014656.

The previous prime is 3665139481291. The next prime is 3665139481321. The reversal of 3665139481309 is 9031849315663.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 158591115225 + 3506548366084 = 398235^2 + 1872578^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3665139481309 - 2⁷ = 3665139481181 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 (3665139481369) 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, 126360904 + ... + 126389905.

It is an arithmetic number, because the mean of its divisors is an integer number (485660681415).

Almost surely, 2^{3665139481309} is an apocalyptic number.

It is an amenable number.

3665139481309 is a deficient number, since it is larger than the sum of its proper divisors (220145970011).

3665139481309 is a wasteful number, since it uses less digits than its factorization.

3665139481309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252751679.

The product of its (nonzero) digits is 12597120, while the sum is 58.

The spelling of 3665139481309 in words is "three trillion, six hundred sixty-five billion, one hundred thirty-nine million, four hundred eighty-one thousand, three hundred nine".