1381685017585 has 4 divisors (see below), whose sum is σ = 1658022021108. Its totient is φ = 1105348014064.

The previous prime is 1381685017571. The next prime is 1381685017591. The reversal of 1381685017585 is 5857105861831.

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 491424834289 + 890260183296 = 701017^2 + 943536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381685017585 - 2⁹ = 1381685017073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138168501754 + ... + 138168501763.

It is an arithmetic number, because the mean of its divisors is an integer number (414505505277).

Almost surely, 2^{1381685017585} is an apocalyptic number.

It is an amenable number.

1381685017585 is a deficient number, since it is larger than the sum of its proper divisors (276337003523).

1381685017585 is an equidigital number, since it uses as much as digits as its factorization.

1381685017585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276337003522.

The product of its (nonzero) digits is 8064000, while the sum is 58.

The spelling of 1381685017585 in words is "one trillion, three hundred eighty-one billion, six hundred eighty-five million, seventeen thousand, five hundred eighty-five".