3861821548518 has 8 divisors (see below), whose sum is σ = 7723643097048. Its totient is φ = 1287273849504.

The previous prime is 3861821548493. The next prime is 3861821548549. The reversal of 3861821548518 is 8158451281683.

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

3861821548518 is an admirable 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, 321818462371 + ... + 321818462382.

It is an arithmetic number, because the mean of its divisors is an integer number (965455387131).

Almost surely, 2^{3861821548518} is an apocalyptic number.

3861821548518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3861821548518 is a wasteful number, since it uses less digits than its factorization.

3861821548518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643636924758.

The product of its digits is 14745600, while the sum is 60.

The spelling of 3861821548518 in words is "three trillion, eight hundred sixty-one billion, eight hundred twenty-one million, five hundred forty-eight thousand, five hundred eighteen".