3881744457865 has 8 divisors (see below), whose sum is σ = 4658154103368. Its totient is φ = 3105355063680.

The previous prime is 3881744457839. The next prime is 3881744458027. The reversal of 3881744457865 is 5687544471883.

It can be written as a sum of positive squares in 4 ways, for example, as 1125576708624 + 2756167749241 = 1060932^2 + 1660171^2 .

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

It is not a de Polignac number, because 3881744457865 - 2⁷ = 3881744457737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3881744457794 and 3881744457803.

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, 4637892 + ... + 5410501.

It is an arithmetic number, because the mean of its divisors is an integer number (582269262921).

Almost surely, 2^{3881744457865} is an apocalyptic number.

It is an amenable number.

3881744457865 is a deficient number, since it is larger than the sum of its proper divisors (776409645503).

3881744457865 is a wasteful number, since it uses less digits than its factorization.

3881744457865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10125659.

The product of its digits is 722534400, while the sum is 70.

The spelling of 3881744457865 in words is "three trillion, eight hundred eighty-one billion, seven hundred forty-four million, four hundred fifty-seven thousand, eight hundred sixty-five".