3861856827445 has 4 divisors (see below), whose sum is σ = 4634228192940. Its totient is φ = 3089485461952.

The previous prime is 3861856827419. The next prime is 3861856827457. The reversal of 3861856827445 is 5447286581683.

It is a happy number.

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 1893576901329 + 1968279926116 = 1376073^2 + 1402954^2 .

It is a cyclic number.

It is not a de Polignac number, because 3861856827445 - 2¹¹ = 3861856825397 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 386185682740 + ... + 386185682749.

It is an arithmetic number, because the mean of its divisors is an integer number (1158557048235).

Almost surely, 2^{3861856827445} is an apocalyptic number.

It is an amenable number.

3861856827445 is a deficient number, since it is larger than the sum of its proper divisors (772371365495).

3861856827445 is an equidigital number, since it uses as much as digits as its factorization.

3861856827445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772371365494.

The product of its digits is 309657600, while the sum is 67.

The spelling of 3861856827445 in words is "three trillion, eight hundred sixty-one billion, eight hundred fifty-six million, eight hundred twenty-seven thousand, four hundred forty-five".