1381085543665 has 8 divisors (see below), whose sum is σ = 1688572514088. Its totient is φ = 1084021860480.

The previous prime is 1381085543657. The next prime is 1381085543671. The reversal of 1381085543665 is 5663455801831.

It can be written as a sum of positive squares in 4 ways, for example, as 16976005264 + 1364109538401 = 130292^2 + 1167951^2 .

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

It is not a de Polignac number, because 1381085543665 - 2³ = 1381085543657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2605821516 + ... + 2605822045.

It is an arithmetic number, because the mean of its divisors is an integer number (211071564261).

Almost surely, 2^{1381085543665} is an apocalyptic number.

It is an amenable number.

1381085543665 is a deficient number, since it is larger than the sum of its proper divisors (307486970423).

1381085543665 is an equidigital number, since it uses as much as digits as its factorization.

1381085543665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211643619.

The product of its (nonzero) digits is 10368000, while the sum is 55.

The spelling of 1381085543665 in words is "one trillion, three hundred eighty-one billion, eighty-five million, five hundred forty-three thousand, six hundred sixty-five".