3891199049865 has 12 divisors (see below), whose sum is σ = 6744745019844. Its totient is φ = 2075306159904.

The previous prime is 3891199049851. The next prime is 3891199049873. The reversal of 3891199049865 is 5689409911983.

3891199049865 is a `hidden beast` number, since 38 + 9 + 1 + 19 + 90 + 498 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2142909521424 + 1748289528441 = 1463868^2 + 1322229^2 .

It is not a de Polignac number, because 3891199049865 - 2²⁶ = 3891131941001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3891199049793 and 3891199049802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43235544954 + ... + 43235545043.

It is an arithmetic number, because the mean of its divisors is an integer number (562062084987).

Almost surely, 2^{3891199049865} is an apocalyptic number.

It is an amenable number.

3891199049865 is a deficient number, since it is larger than the sum of its proper divisors (2853545969979).

3891199049865 is a wasteful number, since it uses less digits than its factorization.

3891199049865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86471090008 (or 86471090005 counting only the distinct ones).

The product of its (nonzero) digits is 151165440, while the sum is 72.

The spelling of 3891199049865 in words is "three trillion, eight hundred ninety-one billion, one hundred ninety-nine million, forty-nine thousand, eight hundred sixty-five".