3861848607521 has 4 divisors (see below), whose sum is σ = 3877872875844. Its totient is φ = 3845824339200.

The previous prime is 3861848607497. The next prime is 3861848607563. The reversal of 3861848607521 is 1257068481683.

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 1947319775296 + 1914528832225 = 1395464^2 + 1383665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3861848607521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3861848606521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8012133800 + ... + 8012134281.

It is an arithmetic number, because the mean of its divisors is an integer number (969468218961).

Almost surely, 2^{3861848607521} is an apocalyptic number.

It is an amenable number.

3861848607521 is a deficient number, since it is larger than the sum of its proper divisors (16024268323).

3861848607521 is a wasteful number, since it uses less digits than its factorization.

3861848607521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16024268322.

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 3861848607521 in words is "three trillion, eight hundred sixty-one billion, eight hundred forty-eight million, six hundred seven thousand, five hundred twenty-one".